It's not what u say but how u say it and you gotta have swagger and confidence as well. But if a girl is looking at u say something like "I see you peaking but you ain't speaking" that'll get her attention. And if she looks at you and smiles or something just keep at her until u get action, say something like "a second look will get you hooked tho" thats ya opener and when she gives you some action just find out her name and say something like you'd like to get to know her better and exchange numbers or somethin, simple as that. You don't wanna give away too much of yaself u just wanna get her number and bounce, only time I believe you should have extended convos and do all this talkin is if you trying to pop off a one nighter or something ya dig.
