White Cap: "Oh man we tried to gate crash this party then this 'seca' stood on my mates brand new Nike's so we dropped him!"
Average Person: "Hold up, whats a 'seca'?"
White Cap: "Security guard bro"
Average Person: "Why don't you just call them security guards?"
White Cap: "Yeah ok, you go ahead and waste your life calling them that. Want a durry?"
When Ronny hadn't seen Ben for two months, and then saw him hanging in a seedy back alley smoking, with his new Kappa pants dragging on the ground, and an XXXXXL polo shirt which looked like a skirt, and a hat which was worn at such a precarious angle it made him look like he was wearing one of those jewish skull-cap thingys, he knew Ben had become a white cap.
Person 2: "Yeah stupid lads I hate those guys man they walk around with their white hats peaked up and think they're like so hard haha oh please"
The term comes from the "white caps" on waves, the white, foamy, uppermost part of a wave.
Dude 2: Did you let her?
Dude 1: yeah, but I white capped her. She didn't even notice till she went to take the hat off, and it was glued to her head!