1. Encouraging directive made by a male for a
female (or male, if that's how you
swing) partner to directly engage the head of the penis in either oral, vaginal or some other orifice-centered sexual act.
2. A derogatory exclamation made from
one male to another as an insult, much akin to telling someone to "suck my dick".
1. Girl: "Ooh,
baby, I am feeling so sexy right now....." Guy: "Well GET UP ON THE HEAD, girl!!!!"
2. Guy 1: "You need to get out of my face,
man..." Guy 2: "GET UP ON THE HEAD, you
fucktard!!!"