To fuck someone or something with great intensity and ferocity.
Wow its a beautiful Spring day. I think I should find a ripe little Asian pussy and hammerfuck the shaved wet slit into next week.
by DankDonk May 08, 2006
Fucking Two Girls at once using normal motion, But having a double sided dildo Inserted into your own ass making it possible.
Yeah Man! I totally hammer Fucked her and her friend last night.
by Xiathis February 03, 2011