Tick

That thing that happens when a girl walks and you're staring at her ass and it moves side to side like it has a rythem to it. Girls with perfect asses will tick with no problem and you can see it from a good distance. Girls who aren't virgins have a tick that moves a lil' up and down.

Damn man look at that girl's ass! She get one good tick brah.

Hell yeah, that shit moves side to side prefect cuz.