The soft pocket of skin beneath the shoulder that joins the inner part of the arm to the body.
The pretty girl's underarms were soft and smooth, hairless and extremely ticklish to the touch.
by Max March 16, 2004
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The wrong way to bowl in a Cricket match. This happened most memorably in a Australia vs New Zealand match in 1981 where the dirty Australians were very unsporting and stole the series by bowling the ball underarm instead of overarm, preventing the New Zealand batsman to score the 6 runs needed to win the series. Goes directly against the Gentlemanly nature of the game.
"No, Greg, no, you can't do that" (Ian Chappell, Commentator of the game and the brother of both the Aussie Captain, Greg, and the offending bowler, Trevor.)

The Underarm '81 incident is "the most disgusting incident I can recall in the history of cricket" (Rob Muldoon, the then Prime Minister of NZ)
by babysharknz August 16, 2009
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The sexual act of putting one's penis inside the underarm of their partner.
My girlfriend allowed me to underarm her on my birthday.
by Commando Matrix August 8, 2010
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The little balls of deodorant that form under the armpit from applying too much or, for those who choose not to shave, from having too much pit hair.
Chris: Hey man what is this under my pit! I have lint.

Steve: Oh no dude that's underarm armor, you are now forever protected from the evil perspiration monster.
by Mrs. shaky bacon December 8, 2009
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A condition of the skin that resembles the growth of multiple vaginae. This candition is. Usually found in the underarms of impatient bodybuilders. Studies have show that his condition is fatal if not treated.
by ftpssy69 January 22, 2011
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1. Underarm fat that continues wiggle and jiggle after you stop waving.

2. Underarm wave
I couldn't help but be distract by her underarm dingle dangle (UADD) when she waved.
by Snookiemil May 14, 2011
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