When a male and female are aroused the male takes his enlarged penis and sticks it behind a woman's knee and beats to his own rhythm
Jack and Emily are naked in bed so emily sands up and jack whoops out his fat cock and sticks it behind her knee and moves his torso back and forth and thts knee pit sex
by Jack and Emik December 30, 2009
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when you insert the penis into a persons armpit region.
"the sweat and hair from the arm pit sex was to overwhelming that i cummed in the hair, making it funny and more slippery!"

"hey dad, why not some father-son quality time,lets play baseball,sorry son no baseball today,lets try arm pit sex instead i heard you get the same work out and a LOAD of fun!"
by coon_slayer March 11, 2005
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when a woman makes love to your arm pit.
young hollywood ho started on my arm pit licking, and kissing in middle on my arm pit. When a girl really loves your arm pit sex kinda turns you on, makes U feel like laying on the beach.

warm sand over your toes nice warm kissy arm pit sex nice safe sex. PS put on mexican shorts
by itichie_nocanpo June 28, 2006
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Like a mosh pit but with screwing instead of moshing.
The sex pit at that gay bar must have consisted of 60 people!
by Winslow R. September 9, 2008
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