Let me guess you typed this in google because boredom. If you didn't see the definition which is either you have or typed it in UrbDic it means a fish. Yes, a fish, A FISH.
Person 1:Hey did you know bsal?
Person 2:A fish.
Person 1:Really?
Person 2: ofc brotha
A word you can misspell and make a guy who still likes among us laugh
Person 1:Can i get fries with tomato sauce?
Person 2:SUS