Smash your back end out

To have hard, vigorous sex with a person.

John: "I'm gonna smash your back end out."

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knock the back out of

This is normally associated with sexual intercourse carried out at a rough and vigorous pace (most commonly doggy-style), although it can be associated with any activity where it is performed with gusto. This means that you did whatever it was you were doing with particular enthusiasm and/or speed

Good morning Casper. I had a cracking time knocking the back out of Lady Clementine Smyth last night

or

Gadzooks, I could certainly knock the back out of a few glasses of Moet this evening

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back out the rambo

If somebody says this run asf as you can dont look back or else your gonna get stabbed. Back out means pull out something in English slang rambo means knife

Bad guy: ay Run your pockets G
Someone: no fam
Bad guy: I'LL BACKOUT THE RAMBO RIGHT NOW FAM I SAID RUN YOUR POCKETS BEFORE MAN CHEFFS YOU RIGHT NOW BRUV
Someone: ok ok im sorry g dont stab me bro
Back out means Pull out in UK slang
rambo means knife Back out the rambo means pull out my knife

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back out bill

1.) One who cannot keep his word and always backs out without notice.

2.) No Call, No Show!

Tony: You going to come over tomorrow for the game?
Bill: Yea I'll definatly be there!
@the party.
Justin:Where is bill at?
Tony: I don't know he never called.
Justin: Good ol' Back out Bill

Blow the Back Out

Doggie style vaginal or anal sex that is deep and vigorous leaving the recipient clapped up good with some rearranged lower intestines.

Imma go home and blow the back out on her tonight.

My asshole is ripped from stem to stern after that random last night decided to blow the back out on me.

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Backing Out Leftovers

The profoundly relieving experience of defecating a large quantity shortly after having a hearty meal. Most known usages occur when a game of mini golf is interrupted so that one player can relieve themselves as such.

“Hold on until Jim returns. He’s in there backing out leftovers”

Back Out Rule

An unspoken rule that dictates when two motorists are parked next to each other and inter their car at approximately the same time, the one that starts his/her car first gets to back out first.
Should the cars start at the same exact time, eye contact should be made to decide who is to back out of his/her spot first.

Adam got in a wreck with a lady who didn't abide by the back out rule. He started his car first, but she backed out first so Adam hit her thinking he was in the clear.

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