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1.
Another genius creation by figure BAPS.

A mixture of dumb and bitch together

dum = dumb
bish = bitch

dumbish
Wannabe Mr.Awesome: Hey man, wanna help me with my self esteem issues?
Mr.Awesome : Shup Dumbish
by Mr.Awesome - BAPS May 29, 2010
 
2.
Basically dumber than ish.
What a dumbish thing to do.
by MastaSwitch January 04, 2007