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1 definition by Wayne Bigmonds

 
1.
(verb) to stick your fingers into the gaping mouth of a housecat and/or baboon whilst it yawns.
My cat Whiskers gave me a nasty scratch in return for a sweet sheenibuth last Wednesday.

My uncle lost three digits on a sheenibuthing expedition in Northern Africa during WW2.
by Wayne Bigmonds February 11, 2008