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.
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.