2 ways, if she makes eye contact, wave her over.
if she doesnt make eye contact, you can shout "hey" "come here a sec"
This is common sense, but the hard part is being man enough to do that.
Also depending on where you are determines the level of how smooth you want to be.
My smoothest approach for girls walking by, if i don't want to be noticed by anyone else, is to walk behind her and open over the shoulder with an opinion opener.
Its easy, but you might want to see a pro do it first so you can see how smooth it really looks.
I got some infields on that, not my best cus recording sucks and i dont do it alot, but clear enough.
https://www.youtube.com/watch?v=qgLjSFGw4To
The first girl i shouted at, cus i didnt care and it felt right as she was about to walk away
The second girl was on the phone and i opened over the shoulder
Keep in mind the environment is a little crazy so you can be crazier
and yes they both resulted on a date. Easy.
In a college campus im alot more lowkey and mostly use the over the shoulder opinion opener.
The key here is to be confident and determined to win.
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