Popping shit is a term that means to talk shit about another person or start a fight with them. This term first came around in 1995 era hip hop, way before the notion of "scene kids" was even dreamt of.

Since "Popping shit" originated with mid 90s hiphop, it's perfectly acceptable to say it in public and even makes the person using the term seem more well-read than the average bear.

Being caught by the enemy without a weapon to defend yourself

Any outfit you put a special amount of attention into constructing, potentially for an event or special occasion, usually with some sort of theme or reference you're attempting to invoke.

Twerking, shaking your booty in a circle, or just shaking your booty in general. Often done in clubs or on dance floors.

When someone reads someone's text, but does not reply.

Verb - wishing you had not scrolled so far into the google image search. Applicable to any internet regret.

"whose ass is it gonna be" or WAITGB is used when trying to figure out who is to blame in a situation, usually to punish them.