whodathunkit 

Shortened version of 'Who would have thought it to be so?'

James: 4 o'clock, Dave. Tea time!
Dave: Whodathunkit!

whodathunkit by Pequod April 16, 2005

whodathunkitwhatsis 

A nonsense substitute word used when you don't know the proper term for something or simply can't remember it. Derived from "Who'd have thunk it" and "what's this?".

My car broke down and Dad has to repair the whodathunkitwhatsis to get it running again.

whodathunkitwhatsis by Emby Quinn October 22, 2003

whodathunk 

Short form for "Who would've thought?"

Kay: MJ is innocent!
Jay: Whodathunk?!

whodathunk by KidProQuo November 7, 2005