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1.
beer belly
The boys are headin' down to the bar to work on their molson muscles.
by labatt March 27, 2004
 
2.
A Canadian term meaning "Beer Belly"
Molson, of course, is a brand of beer commonly drank and celebrated in Canada.
Rob: Yo, did you see that guy at the bar? He was fat!
Bob: Nah, dude, that ain't fat. That's a Molson Muscle!
by molsonman September 20, 2007
 
3.
A slang term for a beer belly. Your stomach muscles have been transformed by beer (Molson) into a protruding stomach.
Eww, check out that guy, he's got a Molson Muscle.
by SoupNotSee November 08, 2010