A person who does either of the following: Uses people for Xbox 360 Achievements; is a fucking social leech/conformist/ass kisser; Claims to like a band, yet only has that one song from Guitar Hero by that band; Lazy (so lazy , they trade crutches for a wheelchair); a poser; and is basically a douche.
"Dude, Joe came over and beat Guitar Hero on medium, and I got a lot of achievements!"
"Tom, you're such a fucking gleason."
"Tom, you're such a fucking gleason."
by Tronnit November 13, 2007
by DUMPeldore January 15, 2009
When the sleeves of someones undershirt are embarrassingly exposed--giving a ruffle-esque appearance.
Dan is the resident anti-poon because he is always gleasoning--his undershirts are always two sizes too big.
by aquadude998 April 12, 2011
the act of unintentionally having the sleeves of your undershirt exposed underneath a polo shirt or other outerwear.
I was going to ask Dan to the dance, but I saw him gleasoning in school one day so I asked Josh instead.
by aquadood April 15, 2011
An asshole who loves to put shampoo down your dick while your sleeping and jerk off to billy Madison
by Fappy man October 8, 2018
The assholes' asshole. Actor famous for roles such as Principal Richard Vernon in The Breakfast Club and Deputy Police Chief Dwayne T. Robinson in Die Hard. He perfected the self-important authority figure until it became an art form which can be watched again and again. In real life he is said to have been a genial man who was quite unlike his famous roles.
by kryptonpirate June 21, 2006
by itouchlittlekids180 April 8, 2019