Dumbass 

1.Someone retarted
2.Arrogant
3.Stupid
Meaning he/she does'nt make sense or understand anything.Does stupid things and thinks they are right.Won't listen or except the truth.

Devin:"Dude, stop touching me."
Austin:"Why?I'm not touching you!"
Devin:"Stop being so fucking annoying."
Austin:"Poke!Poke!Po-"
Devin:"Leave me alone, faggot!!!"
Teacher:"Excuse me!"
Devin:"He's being such a dumbass!"

Dumbass by Trent Frost April 22, 2009

dumbAsshole 

Someone who thinks that they are getting one over you even though you know exactly what is going on.

Look at that dumbasshole how stupid does he/she really think I am? They Must be dumber than I first thought.

dumbAsshole by UneedAmbien April 14, 2010

dumbass 

One who doesnt under stand the word crookshank

He asked me what the word crookshank means so he is a dumbass

dumbass by largelen November 6, 2009

Dumbass 

A buttocks with a degraded memory.

You fucking dumbass. Go fuck yourself!

Dumbass by Spike Minoda July 10, 2004

dumbass 

A guy I know named Aaron who is an idiot and basically a complete screw off until the last minute and even then.....

Aaron: Hey dude how do you convert a decimal into a percent???
Some Random Person: Jeez your suck a dumbass.

dumbass by Game Crazy July 16, 2008

dumbass 

The people who post definitions for Britney Spears.

omg britany suxOrs!

dumbass by Anonymous September 14, 2003

Dumbassery

The complete and total act of being a dumbass.

You must be full of dumbassery for sleeping with your best friend's hot sister and letting him find out from her.

Dumbassery by Dankeshane August 20, 2010