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1.
lose weight,get rid of the flab
girl 1,if he would muscle up he'd be hella fine!

girl 2,yeah hes a bit of a chubbster.
by tntntt December 31, 2008
27 17
 
2.
To hold your breath in the bathroom.
It smells pretty bad in there--no fault of mine. Best you muscle up.
by hrungnir April 02, 2011
3 1