BackPack sex 

Having sex with a backpack buy opening the zipper and sticking your junk in that compartment

"Dude, did you bang that chick?"
"Nah man, I got really drunk and wound up having backpack sex!"

BackPack sex by The Reactor October 1, 2009

Backpack pull 

The act of taking a plastic handle of only the finest vodka (ie. Heritage) to class inside of your backpack and taking handle pulls throughout the lecture with the plastic handle still inside your bag.

Jen:"Why do you have a handle of Heritage in your back pack?"
Steven:"Obviously to take backpack pulls to get through Fygenson's lecture"

Backpack pull by classless teenager December 9, 2010

Backpacking 

slang for a gay males having sex...anal sex...How one would be behind the other person with his arms and hands over his shoulder thereby being like on wearing a backpack.

Like scissoring for Lesbians.

Aw...those guys look like they are going backpacking!

Backpacking by PSBforver February 5, 2010

backpacking 

the act of possessing (packing) a voluptuous rear-end (back). A quality exclusively found in the female gender.

That lil thick shorty I saw at the mall was seriously backpacking.

backpacking by madprophetrix July 4, 2003

Backpack Flipping

The art of having ones backpack flipped inside out. In contrary to the popular term "Nuggeting". When a backpack is flipped where is the nugget. I looked all over for it and I could not find it anywhere. I searched inside of the backpack and I searched outside. I was really hoping to find a nugget cause I was pretty hungry at the time.

I take part in Backpack Flipping

Backpack Flipping by Backpack Flipper May 27, 2007

backpack 

placing a backpack upside down on a butterface and zipping it tight before you go to town.

Geoff: Check out that chick's tits. Her face is jacked though.

Kumar: I'd backpack the hell out of her.

backpack by hoboscratch August 25, 2010

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