What is B.U.N?

Back up nigga . When yo man ain’t acting right you got your bun

when my man take hella long To reply I text my b.u.n

B.U.N - meme gif

B.U.N stands for back-up-nigga, always have one because if that relationship doesn't work out. You always have a backup boyfriend.

"My man ain't shit imma get a B.U.N"
"Damn girl, my B.U.N just got a girlfriend!"