bbb stands for Big Borsch Butt. Usually, people have it due to consumption of famous Ukrainian dish - borsch. Used as a compliment primarily among Ukrainian people.
John: Hey have you met my girl friend Selma she’s a bbb
Robert: ohhh you like big beautiful bitches too
John: yehhh good to see I’m not the only one
BBB is an acronym meaning 'big beefy balls'.
Hey! Did you see that picture of his BBB?