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Manscaping:

The fine art of trimming your ball-hair into a shape more pleasing to your mate, or foregoing it entirely. Ah, feel the sweet breeze of freedom. read more...

Mr. Boneder:

As suggested by a GuySpeak user, a "Mr. Boneder" is a guy who sends pictures of his Johnson to women via email. Can also be used sarcastically to describe a friend's racy photo. read more...

Mangyver:

Much like TV legend Macgyver, this is a guy who gets himself (or his friends) out of sticky situations using only his wits, some duct tape and a stick of chewing gum. read more...

Man Tiara :

A lamentable fashion statement where a man wears his sunglasses on their heads for no functional purpose. read more...

Munson:

(v) To choke or blow it; to muck up an easy gig by doing something stupid. (n) A ne'er-do-well who habitually screws up easy opportunities. Both uses from the 1996 movie, Kingpin, in which Woody Harrelson plays pro bowler Roy Munson, who squanders his fame and fortune on booze, horses and loose women. read more...

Mario Party Stigmata:

The invariable blister that forms at the center of your palm after extended periods of furiously rotating the N64 control stick in order to move Mario's canoe a few inches downstream. read more...

Masturdating:

The act of cruising sleazy singles sites like Fling.com or Hornymatches.com ("The Facebook of sex!") for the sole purpose of mining fappable material. See "fappable." read more...

Mangina:

When a man folds his sex organ under his thighs and simulates the look of the female vagina. read more...

Manly March:

Also known as "Mustache March" in some circles, it's the solemn duty of every truly manly man to go nowhere near a razor, strop, or other shaving implement throughout the month of March. Society may force us to hide our inner caveman for eleven twelfths of the year, but come March first, SHIT IS ON. read more...

Manstruation:

What can happen when a guy is exposed to the chickiest chick flicks, Lady Gaga music, or a day of shoe-shopping with his woman. read more...