man strength 

Strength a man is bestowed with in his mid 30's that isn't physically apparent to an outside observer. A man needs to do nothing to recieve it other than grow old. Many unsuspecting sons and young males looking to prove them selves "manly" aren't aware of this phenomenon and underestimate the middle aged man.

John, the better athelete, can't win a game of one on one because his Dad has man strength.

man strength by Skinnyg November 28, 2007

Man Strength 

Physical strength which is accompanied by intellect and experience which allows a man to totally demolish an opponent of equal strength yet many years younger.

I fought that old dude 6 months ago and i'm still hurting. Now I know what man strength is.

Man Strength by Darryl Hooks March 13, 2009

Man Strength 

The common strength of a man that seems superhuman to all those who do not possess it. In middle school recess, if you got dared into a friendly wrestling match with that guy (every school has one)who was held-back 2 years and already had a full beard and drove himself to school, you would experience the force of man strength. The fingers seem made of steel and grapple with other-worldly force. Eventually, you will be in a full nelson so tight, you wont be able to get the air out of your constricted neck to muster a vocal signal of capitulation.

I found out that Steve has man strength. I am giving him 1/2 of my lunch money for the rest of the year.

Man Strength by Ace Binkley December 24, 2005

man-strength 

Used to describe the suprising ability of older men (e.g. your father in his 40-50s) to out-lift, out-drink, and generally out-work younger and more physically fit men.

I thought I could take my old man, but seeing him move that couch today I have to bow down to his man-strength

man-strength by GT1979 June 11, 2004

old man strength 

the crazy insane strength you gain when you become an old man

did you see grandpa pick up that keg of beer?
Yeah he has sick old man strength

old man strength by caliwolves April 9, 2009

grown man strength 

when one has hidden strength that only a full grown adult would have.

A: Look at that small ass chump over there.
B: Nah chill that boy has some grown man strength

grown man strength by Acie Rains September 3, 2007

old man strength 

The uncanny ability of older men to lift copious amounts of lumber, heavy furniture, and beat their sons in arm wrestling.

Man 1: "My dad beat me in arm wrestling again..."
Man 2: "Of course, he has old man strength."

old man strength by UIC123 May 9, 2011