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

Cum Backfire 

When in the instance of sexual intercourse, during the backward thrust the penis slips out of the vagina during the peak of ejaculation causing a misfire of semen that spurts onto the male's chest.

My wife laughed at me after my cum backfired on my chest yesterday while having intercourse.

Cum Backfire by WakkaWakka101 June 18, 2010

Backwash Cum

When you suck a guys dick, and you hold the cum in your mouth and then exchange it back to him through a kiss.

Damn that backwash cum tasted so good after last night.

Backwash Cum by 0dharpsand0flats November 27, 2019

Backwash Cum

After giving a guy a blow job, keeping the cum in your mouth and exchanging it back to him through a kiss.

Jeez that backwash cum tasted great.

Backwash Cum by 0dharpsand0flats November 27, 2019

backwoods cum drip 

a backwoods cum drip is when you take autumn into the woods and drip come on her.

hey autumn wanna do a backwoods cum drip

backwoods cum drip by PierceTheGeorgiou June 28, 2016

cumback 

After a woman gives a man oral, she doesn't spit or swallow-- she proceeds to kiss the man and give him his cum back.

"Dude after Stacy blew me, she gave me a cumback-- I didn't know it was that salty!"

cumback by JuJuLaylayRiRi April 2, 2009

The cumback 

When a guy blows a load in his partners mouth and after it's done, the partner comes up to kiss him, and the partner spits the load back into the unsuspecting guys mouth.

Aj: "God damn, Morgan gave me the cumback last night!"
Rome: "I bet you liked that mouthful of baby gravy faggot!"

The cumback by Shaniqua jones ;) August 24, 2011