A spin off from the word "Mo" which is short for Homo comes "Big Mo" which describes a really outrageously gay person.
Person 1: OMG check out the guy in the pink unitard

Person 2: Such a big mo
by HarveyBB June 30, 2009
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Momentum. Used especially in sporting events.
Yes! We just scored a touchdown and recovered a fumble! We're still down by 14, but we've got the Big Mo now!
by bro2baseball August 5, 2009
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An outragously obvious homosexua, male or female.

A code used across the world between friends to point one out without causing offence.
Bob: "Check the Big Mo on the dance machine"

Jon: "Slap a wig on dat and call it Mary"

Mat: "I ain't never seen one so bent"
by AndrewAndrew July 10, 2009
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if you a big ol mo; you gay. Reallll gay.
mickey milkovich-“Im f***in gay. Big Ol Mo.”
by uhhhhidk.. September 24, 2021
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A little man with a huge, and I mean HUGE COCK. Also known as a BCM.
He might be just 5"4, but I heard he's a big cock mo.
by bigbenj April 3, 2015
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Terminology used for a friend with a big dick and has the initials of M and O. It can also be used to represent the alpha male in your group or the man who has shown is dick/penis to his/her friends.
Yesterday I met Big Dick Mo.
Big Dick Mo and I went to the part yesterday, it was lit.
by JackKnifexxxDeepInTheHolexxx69 October 28, 2019
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A big MO is when a person snitches on others , a big mo is also the person that commits the act of snitching itself or is known for engaging in snitchery.
Faisal is such a big mo , he went along and bigmo’d us to the authorities .
by Don fizz August 22, 2021
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