The full meaning on that abbreviation is "Big Black Bruh". It got popular after Dankus Memecus said it several times during his streams on HoI4. Actually, there is a point of view, that he was just stammering with the first "b"-letter, which created an effect of "b-b-bruh" that then transformed into BBB
*your teammates losing 8 tanks in one encirclement*
you: bbb
bbb/BBB= baby boy, similar to bbg but for dudes, typically a joke, but in a homie loving way- its not gay, unless you want it to be 😏 but can also be used for a cute nicknames for people to call their boyfriends.
omgg hiii bbb!!!
john- did you hear sasha called me "bbb"? whats that mean marven- bro that means "baby boy" she's totally in love with you.
Big beautiful blackie: When you a thicc black beautiful force of nature. Denoted by your ability to eat hoagies and brownies for breakfast while still maintaining flawless melanin rich skin
Zoë: Damn, get a load of that thicc BBB brotha scarfing down wings over there. I’m gonna go see if they have room for desert 👅