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1.
An excuse a man makes when his girlfriend doesn't want to get it in. Happens when she doesn't like it.
Ryan told me yesterday he was too tired to get it in
by shedoesn'tlikeit October 25, 2011
 
2.
A lame excuse used by some for getting out of spending time with girls.
"I can't play Halo, I'm too tired."
by Big Ass February 08, 2004