When you fuck a girl from behind who is taller than you so you have to sort of climb on her back like a backpack to fuck her. It's similar to doggy style
Yo, I totally hooked up with that volleyball chick, but she was taller than me so I had to fuck her backpack style
When your sexual partner is giving you a piggy back ride and you are giving it to him/her in the butt.
Hey Shelly why is your back sore o me and my boy friend were just backpack style all weekend.
When you wrap barbed wire around your penis and insert it into a vagina or anal cavity.
Bob: Did she like that cactus in a backpack yesterday?
Steve: Oh yeah, she said it was the best cactus in a backpack she's ever gotten.
Someone who gets the sloppy seconds after the female has been fucked in doggystyle by another man who creampied her
Josh is a loser he keeps backpack fucking
Refers to a huge affectionate squeezy-clasp whereby you wrap both your arms and legs around da person, so dat you are suspended off da ground from da other person at four attachment-points, like a strap-on bookbag.
Backpack hugs are awesome; just make sure dat da person whom you're giving one to is large and physically strong enough to safely support your entire body-weight like dat.
A person who rides on the back of a motorcycle is a "backpack"
A motorcycle backpack is a person who sits on the passenger seat of a motorcycle.
Girl: I wanna be a backpack so bad
Guy: hop on the back of my motorcycle
A VERY MEAN WORD THAT ISN'T GOOD >:((((
the sentence you just produces from the combination of wires and scripts that you call a phone makes 0 sense, wires being the backpack word.