by shareski November 13, 2011
by SharpTheDemon October 30, 2015
by wullie macd July 23, 2006
by Kingdong August 17, 2006
A demand to be a man and to stop acting craven or cowardly. A derivation of man up (which in itself is a derivation of cowboy up), although more insulting. While man up can be used as encouragement to do something, sack up is almost always a challenge to cease doing something that should be beneath you
"Oh sweet mother of god! The terrorists are going to blow us up with Snapple bottles!" _This_ is terrorism's A-game? Sack up, people.
by Quine August 13, 2006
When getting into your bed at night and realize your child has decided to hide in the form of a sack of potatoes.
by Jinxie Dee Breece October 18, 2020
When your turd hits the back of your nut sack its like the two things guys pride them selves on most high five each other. Thats a sack slapper!
by Handyandy12345 January 20, 2009