Backdoor Knock

When having sex doggie style and the guy's balls smack the girl's ass.

We were doing it doggie style last night and I gave her the backdoor knock.

Backdoor Knock by Lawnmoore February 5, 2009

I'm gonna cum to your house and knock knock on the back door 

A dirty way of saying surprise butt-sex.

1.Waffles: Hey Dwarfo, I'm gonna cum to your house and knock knock on the back door. If you don't answer, I'm gonna bang bang!

Dwarfo: Yeep! I hope it isn't too surprise!

2. What rapists say to little kids when they are gonna butt-rape them.

I'm gonna cum to your house and knock knock on the back door by Dr. Dirty October 9, 2008

knock the back door in and put the extension up 

Polite euphemism for anal sex, just crying out to be written into an updated Carry On film based around DIY enthusiasts.

Jack Douglas : "I'll be finished as soon as I've knocked her back door in and put me extension up"
Sid James : "Hwar har har!"

knock the back door in and put the extension up by TC Raymond August 15, 2005

back door knockers 

Testicles, or bollocks - a name given due to the action of the guy's balls slapping a girl's arsehole during frontal sex

"I was really going for it and she was loving my back door knockers."

back door knockers by Bollywoody April 26, 2015

knocking on the back door 

Pressing the tip of one's erect penis against a woman's anus in the hope that she'll agree to anal sex. This technique is futile 99.753% of the time, but persists due to the collective male delusion that women secretly love to be invaded in this way.

Boyfriend: (knocking on the back door)

Girlfriend: How many times do I have to tell you??? Get that thing away from there!!!

knocking on the back door by Carl Pinkerton May 16, 2009

Knocking at the back door 

When someone with a hard on grinds it against your ass while dancing, cuddling, spooning, or just standing behind you.

Tanya loved spooning but hated when her boyfriend used it as an excuse to go knocking at the back door all night.

“That guy at the bar was cute but he was knocking at the back door all night on the dance floor and that’s why I didn’t go home with him. Why bring someone home if you know he’s just packing half a roll of Life Savers in his pants?”

Knocking at the back door by Brett Burkhardt April 27, 2008

knocking on the back door 

When a man feigns an attempt at anal penetration in order to startle his partner.

Woman: I told you I don't do that!

Man: Don't worry, I'm just knocking on the back door.

knocking on the back door by wiggy_G November 20, 2009