Sack Whack on the Back Crack 

The act of thrusting the man junk so far into a woman's (or man's if you are homosexual) anus multiple times that the balls consistently slap against the "host's" butt cheeks making a sound like a great high five.

KirtKanReed: "i am soo hungover bro, i can't remember anything about last night."

ChadKant: "you wouldn't want to."

Zenovia's Playa: " YEAH! BECAUSE CHAD GAVE YOU THE sack whack on the back crack WHILE YOU WERE SHIT FACED DRUNK LAST NIGHT AND PASSED OUT ON THE COUCH!"

Sack Whack on the Back Crack by Zenovia's Playa June 14, 2009

in the back door 

In the doggy style position, to act like you're going to stick your dick in the pussy but you stick it in the ass instead.

I bent that bitch over, she thought I was going in the pussy and then BOOM, I went in the back door!

in the back door by ThatMotherfucker December 16, 2014

We gotta get spongebob back 

A stupid YouTube video with poorly drawn characters that look like they’re from the bottom pits of hell and all the octopus guy says is WE GOTTA GET SPONGEBOB BAAAAAAAAACK

Squidward:WE GOTTA GET SPONGEBOB BAAAAAAAAACK
Larry:Why
We gotta get spongebob back

We gotta get spongebob back by Apples are better then oranges November 16, 2017

commit suicide by two gunshot wounds to the back of the head

commit suicide by two gunshot wounds to the back of the head: saying something against the government. in reference to Gary Webb who was assassinated by two gunshot wounds to the back of the head for exposing the CIA hiring drug dealers to sell cocaine to raise untraceable funds and the fact that his death was ruled a suicide.

"I'm gonna commit suicide by two gunshot wounds to the back of the head in a week but I don't care, Donald trump is a lizard person.

commit suicide by two gunshot wounds to the back of the head by gogos1073 December 13, 2020

BIKE BACK! 

What crazy bikers say when they are 100 feet behind you but still afraid of hitting you.

BIKE BACK!
What?
GET OUT OF THE WAY!

BIKE BACK! by Random John July 10, 2003

sex-back 

When it is so hot you back is coated in sweat, like after sex.

Walking around in this heat has totally given me sex-back.

sex-back by Daniel Ka July 19, 2007

sexy back tan 

the tan you get after a cross country meet due to the hot sun and the cut of the xc jersey

"dude after saturday's xc meet i got a sexy back tan"

sexy back tan by jordan_cesneros January 23, 2009