Threat suggesting that the enemy should leave or be quite. The enemy may take the advice (see punked) or disregard the advice (see toe to toe or fight).
Back da fuck up nigga. If someone tells you to back da fuck up nigga, you better do as he says....
or you'll get smackedthe fuck up.
Some youtube prankster came up to me asking if I wanted to kiss his ass. I said 'back da fuck up nigga.'
He wouldn't so I gave him a solid right hook and broke his jaw.
By Bonnibelle
Back The Fuck Up Before You Get Smacked The Fuck Up