Meaning to literally "bite down" or shut your mouth for saying something stupid.
Man 1: Who is you're favroite rapper?
Man 2: Man, I don't care what anybody says, Soulja Boy is the best artist of our time, and I think that....
Man 1: Bite Down!
when someone pops a bean (takes an ecstacy pill) one of the side effects is clenching of the jaw..hence biting down
man i popped a bean and now i just bite down
get drunk, get high, pop a bean, do a line or two
same as above, man go head and bite down made popular by boyz n da hood rap group
1) When you are about to hit it hard. You've taken a few hits and a few sips of drank, but then you realize that one chick is not coming to the party so you BITE DOWN. Poppin bottles, rollin, smokin bud, no limit baby. You're gonna get F************d!
2) A reference to fights or TSGH. When you know you're about to commit and do it for real. When you want to fight and are ready.
1) Guy A: "Dude I'm so pissed I got fired for coming to work highhh. WELL YOU KNOW BOI NOTHING TO DO BUT --BITE DOWN
--. PASS THE PIPE, GIMME PILL, MIX A DRANK."
Guy B: "BITE DOWN BOY!"
Guy C: "BITE DOWN!"
Guy D: "BITE DOWN!"
2) "Nobody thought Chris would hit that D-bag, but then Joey screamed BITE DOWN
. Then came the PUNCH!