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2.
To laugh to the point of physical weakness
I was getting weak at that youtube video.

We were standing there talking about how ridiculous John looks, and then he walked in with his hair all screwed up and we just got weak.
by MOHR December 20, 2008
 
1.
v. Gettin Weak is something you do in reaction to something very funny.
"Oh Shit Man! That homeless guy with the fresh produce is hysterical! I'm Getting Weak!"
by johnathan. December 21, 2008