Backfuck 

When a woman's shoulder blades are squeezed together, making a canal that is then fucked.

That girl was awesome, she let me backfuck her.

Backfuck by Wordpioneer October 11, 2014

Backfucker 

A backfucker is a player who will stab u in the back even if u r in the same team as long if he will get better from it. U c backfuckers in evey kinda off game also see buttfucker

Backfucker:im all out of ammo!
Teammate:u shouldt had saved some.
Backfucker: Woh look over there!!!
Teamate:huh theres nothing there!
~backfucker stabs teammate to death and takes his ammo~
Backfucker:yay ammo
Teammate:u backfucker!

Backfucker by !van September 24, 2005

banfuck 

When you get banned by some hax server but hurts really hard like if you where getting it in your butt.

You have been banfucked from our server! Now gtfo, (name) (banhammer)

banfuck by Maritojuionsho November 14, 2017