An 808 is a specific brand of drum machine (Roland TR-808) that were used a lot in rap music

a roland cr78 rhythm machine combined with a tr-808

I'm really trying to find this answer to, but after going through loads of Internet pages, it's either a Roland CR-78 or a Roland TR-808.

This refers to a drum synthesizer or "drum machine" known as the "Roland 808".

"808" means butt because in a song i heard it said shake that 808 so apparently it means butt get it straight ya'll.