If you're fucking your woman from behind, right as you're about to cum you karate chop the back of her neck to render her unconscious and thereby causing a contraction of her vagina which adds to your pleasure.  The key to yell "Hiya!" right at the point you administer the karate chop.
Dude, I gave your sister the Nantucket Ninja last night and not only did I have the best orgasm of my life, but she doesn't remember a thing!
by Graham Rayburn February 16, 2008
Get the Nantucket Ninjamug. Runescape God and icon worshiped by all who know him and loves to kill noobs with his friend Runeknight 95.
by Bob Jones January 9, 2005
Get the fear ninjamug. a person of very small stature; small enough, in fact, to allow permanent residence in the pocket of an individual. Sometimes referred to as a mini-hoe or a nano-pet. Also has a deep love for robot chicken.
i am so glad my roommate is a pocket ninja! 
that is one sexy pocket ninja!
we need pocket ninja here immediately to join us in the viewing of this robot chicken DVD!
that is one sexy pocket ninja!
we need pocket ninja here immediately to join us in the viewing of this robot chicken DVD!
by boomersooner4eva January 5, 2009
Get the pocket ninjamug. by Mandizzle April 13, 2004
Get the the dark ninjamug. Ninja Boots, taken literally, are these happ'ning fashion items that have a defined toe in 'em, much like the mythical ninjas of feudal Japan.
"I'm thinking of buying me some ninja boots to impress the babes"
"I was under the impression that you were a homosexual"
"I was under the impression that you were a homosexual"
by Jackie Onassis July 4, 2006
Get the ninja bootsmug. Rachel's lover
by The Reverend Alex February 18, 2003
Get the wonderbread ninjamug. "They pulled a total Sex Ninja move and made me jizz using only their thumb!"
They must have gone to Sex Ninja school 'cause they fucked me balancing on one leg on the edge of the bathtub!"
"That Sex Geek made me cum so many times and in so many ways that their nickname is Sex Ninja."
"Sex Ninjas can make you orgasm anytime, anyplace."
They must have gone to Sex Ninja school 'cause they fucked me balancing on one leg on the edge of the bathtub!"
"That Sex Geek made me cum so many times and in so many ways that their nickname is Sex Ninja."
"Sex Ninjas can make you orgasm anytime, anyplace."
by ReidAboutSex August 25, 2011
Get the Sex Ninjamug.