When you are really trying to flirt, what do you do?

Lots of eye-contact, ask lots of questions, drop compliments in as often as possible.

Works on boys and girls.

Eye contact (the eye contact is very important), attentive listening, nodding (how fascinating you are!), touching (not inappropriately but physical contact).

Very subtle eye contact, and not a lot of it. I let her sense an interest and then I back off. If she’s interested she’ll show up next to me. When she’s okay with approaching me it works much better.

A certain look in my eyes, and a playfulness in my speech. If I’m definitely interested, I am pretty forward, too. When my now-husband and I were in the flirting stages, I called him and asked him if he’d like to take me out the next night (for our first date). He asked where I’d like to go, and I said, “Your house.” Done deal.

I’m humorous, attentive and bold. Most recently I passed a note on a napkin to someone in a restaurant. No guessing games with me, you’ll know pretty quickly. I don’t do coy, if I;m interested you’ll know it, and likewise if I am not.

Humor and intellectual seduction.
It totally worked, but there was also a prior interest (and plenty of alcohol involved as well).

Squirm like a little child.

Agree with those above, it’s all about eye contact. Including the look, glance away, look again and hold the gaze move. And smiling. I don’t know how/if this stuff is learned, it just seems to come on when the timing is right.

I mostly get an erection & a gormless grin often plays across my lips.

I’m not even sure what would be considered flirting or not. Basically I just try to be personable, listen to what they have to say, make eye contact, but then back off. This seems to work well for me, though I’m not sure why. Ironically this behavior of mine is just a natural part of my personality so it’s not like it’s a deliberate thing on my part to try to get women. It seems that I get women when I don’t try to for some odd reason.

I just wear a suit, my black trench coat, and my black fedora and sit at the bar while driking bourbon and watching people. The ladies do the rest. Just remember, some got it, some don’t.

It’s funny but when I first read your question I thought it was “When you’re flirting, just what is it you’re trying to do?” (as in, just what are you after???)
But that wasn’t the question. Intentions can vary from playing to seriously interested, right?
As a few people have said above, I use my eyes, and I am adept at using my eyes to flirt, since I used to be extremely shy and had a hard time being talkative. But one of my main ways to flirt is to tease. I love poking fun. It gets men off their guard. They don’t know if you’re serious or just joking. Of course you garnish your jibes with a little sly smile. I loved the teasing Cher used to do with Sonny on their show. She had the upper hand and she knew it. Hell, even if you don’t have the upper hand, it’s good to act as if you do! I have used her technique and yes, it even works on gay men, lol. Notice the hair flip she was an expert at it! No one deserved it more than Sonny. She knew how to dish it out.
I found this excellent and exhaustive guide to flirting. Hmm, too bad I’m married. I’d like to test this out. But maybe you can? and report back??

I’m not sure I actually am a reliable source as to what I do. It seems that people think I’m funny. This seems to help.

I flirt online. That’s almost child’s play because you can say the most outrageous things here, and people will respond. And once you’ve got them talking about outrageous things, you can take them anywhere you want to go, I think.

But in real life… I’m not sure. Much harder to flirt in real life. I guess eye contact, and smiling, and being suggestive, but not in an obnoxious way. But if she responds, ups the ante, so to speak, then you know you can go wherever you want.

Maybe she’ll even volunteer to show you her special “lingerie” collection. You know, it took me a long time, but I finally figured out that lingerie is a fancy word for underwear. She wants to show me her underwear! Hey. I don’t mind. Although it does tend to make my pants feel a little tight.

Pretty weird, eh? Do you think I should let her know?

I’ve held the eye contact just a little longer than for acknowledgement. It works two ways, the guy either thought I was a weirdo or he understood I liked what I was looking at. It worked very well.