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Buttwink 

A buttwink is when a person flexes their anal sphincter, causing their anus to visibly contract, effectively "winking" with their asshole. Buttwinking can be performed as an obscene gesture, or in a sexual context it can be either a sign of affection or a greeting.

To buttwink, simply use the same muscles used to defecate to flex your anus.

This act should not be confused with mooning (merely exposing your anus) since buttwinking is considerably more rude.
As Sensei Doug walked to his dojo, the rude employees of a strip mall store lowered their drawers, pointed their behinds towards the window, and contracted their assholes to buttwink at the passing martial artist.
Buttwink by Sensei Doug December 6, 2017

Bill Buttlicker 

The character Jim Halpert uses from "The Office" to fuck with Dwight Schrute during a customer sensitivity drill over the phone in front of Michael Scott.
Jim Halpert: Hi, This is Bill Buttlicker and I'd like to buy some paper.

Dwight Schrute: Wait, that's not really your name, Bill Buttlicker?

buttkicker 

A word that pertains to someone or something that "kicks butt".

However, recently, the word has devolved to be used as a noun, adjective, verb, and even an idiom. In reality, buttkicker is simply the grammarically incorrect way of saying "kicks butt".
Sam: When your friend tries to make good roasts but then ends up failing: buttkicker.
Tom: STFU Sam you degenerate that isn't how you say it.

Buttfingers

someone who scratches their ass and then their fingers smell like shit
my husband has buttfingers after he scratches his ass
Buttfingers by yourcrazy April 25, 2006

buttlicker 

a person who licks ass hole and likes it. someone who likes the smell of ass.
buttlicker by Anonymous June 9, 2003

Buttweiner 

A tumor on one of your buttcheeks that resembles a weiner.
He showed me his buttweiner in the locker room. I told him to go get that thing checked out.
Buttweiner by mandyman January 31, 2009