A man who displays him self as tough and displays a macho big guy when in realty he has a very small penis
Woah have you seen the size of that guys truck he must have ' little man syndrome'

Jacob acts all hard he has 'little man syndrom'
by Isabelllladeen99 May 5, 2016
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Similar to short man syndrome. Except the bearer of this awful title doesn't have to be short, stubby, vertically challenged or petite. Although short dicked is a common trait. And obviously angry. Usually at the world for getting dealt the short hand, or in this case the Sundance hand. He walks around with his face all red, his chest puffed out, and a chip on his shoulder. With a name like Sundance who can blame him?
Who's that party pooper over there all pissed off taking all the candy from those kids? He's acing like he has Sundance man syndrome.

Whats your friend's name? Moonwalker? Sunscreen? Sunburn? Sun of a bitch? Ohhhh!!! Duh! Sundance! Who could forget that? Silly me!
by Shoshy April 8, 2019
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An angry male of below average height who feels it necessary to act out in an attempt to gain respect and recognition from others and compensate for his abnormally short stature. Also synonomous to little man syndrome.
he got sms
by MUSOM February 22, 2005
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Big Man Syndrome (BMS) is marked by delusions that because there's a girl willing to sleep with you and hang on your every word (hence being a "big man") that everyone else, particularly males, are equally enthusiastic supporters of the mindless bullshit you purport. Other symptoms include: unwillingness to listen or compromise, unreasonable demands you expect to be fulfilled and the belief everyone else shares your interests.
"Man, Sean won't shut the fuck up. Ever since he started dating what's-her-face he's had some serious big man syndrome."
by H8 BIG MEN March 8, 2010
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When a man of short stature feels insecure and as a result feels the need to belittle and offend others to make himself feel proud.
When a small man (with little man syndrome) greets you with: "Oh still feeling ill? By the looks of you, its pretty obvious!" (or something similar)
by S. Ashburne February 23, 2010
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Condition whereby undersized men compensate for their smallness by physically asserting their presence.
That Puerto Rican just freaked on me when I stepped on his puma—he’s got a bad case of little man syndrome.
by P. Chop October 16, 2003
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Abrv. BMS. The frequent and potent finkel air excretion caused by ingestion of large amounts of beans and bean biproducts. Most commonly caused by excessive burrito intake. Syptoms can last for several days and can include diarreah, motorcycle-like sounds, and a trail of rank gas potent enough to clear even the largest of rooms.
"My friend is BMS'ing because he can't keep his hands off those damn Grandito-Burritos!"
by Shawn July 12, 2005
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