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1.
Say it to someone who says or does something stupid or embarassing. Meaning they should stop what they are saying or doing.
Person A: Hey I'm totally going to get laid with all of the girls in our class.
Person B: Your done, grab some bench.
by Dark Shadow459 March 19, 2011
 
2.
a way of asking someone to sit next to you in a casual way
You might want to grab some bench, this is a long story.
by emmett0615 January 13, 2009