(In reference to a sexual act) When you are having sex in a doggy position and grab a hand full of hair to arouse your partner and declare dominance. Then immediately push your hand forward to force your partners head into the bed and begin furiously banging away like a caveman. Grunting is acceptable during this act, as it further supports your dominance.
"Dude, last night Nathan totally cavemaned that swamp donkey!"
"Alicea thought she could control me, but i flipped that shit around and pulled a caveman on that hoe."
"I'm feeling all primal and shit, time to caveman some strange."