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1.
Also see dipstick,nit wit
(combonation of dipstick and nitwit)

an idiot, stupid person / someone who acts that way

i.e A straight up dummy
1: Can pinguins fly?
2: no, you dipnit!
1: IM TELLIN MOM, YOU CALLED ME STUPID!
by Carliebabe May 16, 2006