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1.
Someone you do not want to waste time with. Either they've had too little sleep, too much to drink, or they get a significant other.
Don't bother calling Johnny tonight, he's a write off.
by Hu_Jia August 17, 2006
 
2.
A phrase initiated by the esteemed Karl Rove to represent anything, and anyone that is cheaper to replace than repair. In other words, anything that is, or anyone who does something irrefutably stupid, annoying, or out of place.
-"Oh Shit! Anyone want to go to the Gallery?"
-"The Gallery's a write off"
by Brother Flash November 06, 2008
 
3.
To be dumped. Taken from the Real World: Austin.
Boy: I am writing you off.
Girl: Your writing me off.
Boy: To some degree, yes.
by Long Johnson July 11, 2005
 
4.
To make love to a girl in a hardcore fashion (to shag the brains out of her)
See that girl over there, im gonna write her off later.

Mike: Alrite Jon what did you get up to last night?
Jon: Saw the mrs, put it this way she was a total write off last night.
by jellyrim May 20, 2010
 
5.
To be beaten so bad that you have to goto intensive care. Derives from a car being "written off".
Blud, Marshall got write off! He got slew, blad!"
by b'aaand ta get sleeeew May 11, 2004
 
6.
A stupid person.
Andrew is such a write off.
by Patrick January 07, 2004