G.B.U.M
The most annoying guy ever who talks too much and thinks he’s the best at everything, even when he’s clearly not.
My math teacher is a G. B. U. M. He talks for 45 minutes about how he got a B+ once.
My brother’s G. B. U. M. is so loud, my cat ran away.
My mom said my dad is a G. B. U. M. because he still thinks he’s cool.