It's a term you use if somebody is being mad annoying and/or talking shit.
Jordan: look at u with ur uglay ass
Me: stfu bumass nigga
Jordan: She just called me a bumass
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Just another way to say and spell the word ugly. Bumass people use this word mostly.
Dwayne: i like ur shoes
Jordyn: thanks bro
Dwayne: nah jk nigga... them shits are uglayyyyyy
Jordyn: iight stfu bumass nigga
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