biff

Definition

A playful smack to the forehead with an open palm, typically administered to friends being ridiculous or saying something dumb. Think of it as physical punctuation for "are you serious right now?" Popular in the '90s and early 2000s before people got too worried about consent in friendly violence.

Example Usage

When he suggested we could totally make it to Vegas on a quarter tank of gas, I gave him a quick biff.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=biff&defid=17777)

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