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1.
A very juicy cross between a kumquat and a pussy.
Frank: How'd last night go?

Ben: Pretty damn good, I was eating out Erica's pussy, and that shit was like a kumtwat, there was juice E-V-E-R-Y-W-H-E-R-E!
by Kum-Twat August 26, 2011
 
2.
A vagina that wont stop cumming
My girlfriend has such a kumtwat!
by VMiamiFortyFiveZeroOne September 11, 2010