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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!
Big Mo by bro2baseball August 4, 2009
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"
Big Mo by AndrewAndrew July 10, 2009
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 .
Big mo by Don fizz August 22, 2021
big mo is the type of person you want to be, its a charming person with the most attractive eyes youll ever find. everyone needs a big mo in their life to keep them motivated
big mo by Mo Monsta April 28, 2022
Sexy, Sexy man. Pulls all the hoes with his immense gravitational pull. Simps over Anas. Him and Mahad are sworn enemies, have been since birth. His aspirations in life is to join Al Qaeda and to have Anas turn his holes inside out
Oh my is that Big Mo!
What a sexy sexy man.
Where's his Anas?
Big Mo by Andrew slate September 25, 2023
Being trumped, scammed, or done over in some sense
Jeff's gf left him for Tony. Tony has Big Mo'd Jeff.

Jeff abused the rental car. He Big Mo'd it for the rental company.

Jeff promised several dreams to Jennifer to have sex with her. In the end, it was all lies, and once he shagged, he left. Jeff Big Mo'd Jennifer.

Actually
Big Mo by Mig bo June 15, 2024