Beer muscle is the overly fat midsection resulting from excess beer consumption. Most often used in conjuntion with a brand namebeginning with the letter "M".
A special kind of muscle that can only be created by a few men in this world. To grow the type muscle you must drink many many bud lights whether it be keg can or bottle beer, as long as it's bud light. The only twist is that you have to be born on valentines day. In this case all the bud light that's consumed will become Beer Muscle because of all the 12 ounce curls and the females love it.
"Check out that guys muscles. I heard he doesn't even work out."
"He doesn't, he just drinks Bud Light every day and developed beautiful Valentines Beer Muscle"
Man1: I'm a gonna go and pick up that incredibly hot girl over there - the one who's sitting with that huge looking footballer.
Man2: Whoa, haven't your beer muscles grown!
Nigga 1:"Tray was trippin last night, man. He drank 3 forty onces and smoked 3 blunts and tried to fight 2 big ass nigga's who been smart eye'in him the whole night!"
Nigga 2:"You right, you right. Nigga had beer muscles! One dem nigga's is a linebacker for Virginia, that nigga was a mob beast niggy for sho'.I'm juz glad Tray pulled a hernia befo' the fight even started so no fight went down. Nigga thought he could pick up a 50 inch plasma and toss it at a nigga like a baseball, he perp."