A profound expression on one's face that resembles that of a shit eat'n grin. Usually remains permanent at all times regardless of the situation. Dates back to an ancient Albanian custom to intimidate their enemies and daughter-in-laws. Has recently become a trend throughout the civilized world and has replaced breast augmentations as the number one plastic surgery procedure.
As the blackjack dealer sucked the last remaining chip from my stack, all she did was stare at me with that Becky Grin.
by Frank Booth December 21, 2004
Get the Becky Grinmug. Showing in an insinuating smile that shows to have some secret knowledge that may be harmful or embarrassing to the person the grin is aimed at.
by JustMae November 2, 2013
Get the sly grinmug. An alcoholic beverage created by late Pantera guitarist Dimebag Darrel. It is Whiskey with a splash of Coke. The drink is named after a line in the Megadeth song "Sweating Bullets."
by Matt2.0 November 6, 2008
Get the Blacktooth Grinmug. (noun) the crease created between two large breasts when they're pressed together in the middle. The valley of the cleavage.
by Holly M S May 24, 2010
Get the Boobie Grinmug. by knowsstuffdude March 25, 2017
Get the fist grinmug. The silly grin that a girl gets when a boy she likes, calls, remembers her name, smiles at her...shows any sign that she can perceive as hope for a future.
Male equivalent: unknown.
Male equivalent: unknown.
by jemt July 16, 2008
Get the boy-grinmug. Similar technique to the dirty Sanchez with the difference being where the lint, cheese, and or sweat is scraped from ones grundle area and smeared under the nose or across the mouth of an unsuspecting individual to simulate a mustache or grin of grundle goo.
After a laborious day at work, upon arrival at the divorce lawyers, I greeted my ex wife with a sour grundle grin.
by Basismskister June 28, 2014
Get the Grundle grinmug.