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1.
n. to be a dork, nerd, and/or geek but in a humorous and entertaining way.

similar to goofball.

also see DOOF.
>"I just tripped over my own foot."
>>"You crack me up. You're such a doofball."
by Gerard Lazo August 17, 2005
 
2.
An official sporting event that is played in a room with a huge blow up ball.the opponents hit the ball as hard as they can at each other and score
MICAH-lets play doofball
by DOOF DA GOOF December 17, 2006
 
3.
n. one who partakes in peculiar activities.
"Look at that doofball! Honestly, who counts how many chocolate chips are on a cookie?"
by Edgar B September 14, 2005