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".

when you're hungover as shit after a spending a night drunk as a skunk

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

look down on u
despise u

A disease infecting the human body. The diseased person does not fully realize they have it. Symptoms may include staring off into space, not being able to close your mouth, inability to step touch, and not having responses to individuals

when a person punches a woman's boob in an upward direction and then immediately downward. it hurts really bad

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