when a bitch is arguing with you, you take out your wallet and slap her across the face with it. Clarification: you are not simply throwing the wallet at her or hitting her with it, you are holding one fold of the wallet in your hand and flicking your wrist; thereby causing the other fold to flip out and slap the intended target.
a girl keeps talking about how a flier for your organization's party is offensive to women. in order to spare yourself the effort of having to pretend to listen, you quickly remove your wallet and perform the "wallet slap." She never saw it coming and is completely silent afterwards; thus saving much needed oxygen from being wasted.