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2.
Used in many sports for conditioning, or punishment. Drill started by saying "get em going", and that is the cue to start chopping your feet. When you hear "hit it" drop to the floor on your chest and get up as fast as you can and continue chopping your feet. Very pain full
Up Downs are...

Football: Stop holding your dicks and make a tackle. GET EM GOING HIT IT!
by alexangelidis December 09, 2008
 
1.
The standard unit of measure for blowjobs, push-ups, sit-ups, and other events of a cyclical nature. The unit symbol for up-down is "ud".
Alec only lasted 2 up-downs.

Alex, you owe me 12 up-downs because I won that bet.

Bro, how many up-downs did she give you?
by G.T. IV April 23, 2010
 
3.
when you are drunk and the room is spinning so you cant go to seelp. you ay down, you sit up, yotu lay down, you situp. it sux
i am drujnk, so ihave the updowns
by jason November 11, 2004
 
4.
when a person punches a woman's boob in an upward direction and then immediately downward. it hurts really bad
"ow i just got up-downed"
by Shannon Rose Kelsey February 13, 2009