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1.
A true master of the stealth orgasm, a clit ninja is capable of manipulating the clit (the sex organ primarily responsible for female orgasms) completely undetected and with astounding results; a clit ninja is also just generally good in bed.
Amy was so bored in Algebra, she slipped her hand down her skirt and had at it. What a clit ninja.

Tom went down on me for five hours last night. He's my personal clit ninja.
by nihil8r September 24, 2004
 
2.
A ClitNinja is someone who consistently manages to bed women yet appears to friends and family to be a shy retiring self conscious introvert.

ClitNinja is a term given to he who does not conform to the status quo of being needlessly attractive yet still manages to close the deal time and time again.
"did you see that geek just leave with the fittest girl in the club?.. Guy must be a serious ClitNinja"
by ClitNinja March 13, 2010
 
3.
A lesbian; the "opposite" of an ass pirate. Though "lass pirate" may work, also.
My girlfriend and I are proud clit-ninjas.
by Geech<3Kween September 23, 2009