brother-in-sin 

Term for live-in lover's male sibling.

My brother-in-sin doesn't like tomatoes.

brother-in-sin by Johnny J. Rockability January 4, 2011

Commit a sin

Jerk off; complete an act of lust; sexual things

Brian: "Where you going bro?"
Jake: " Going to commit a sin, duh!"

Commit a sin by Shadows23214 April 22, 2019

buy party sin

Buy party sin
The only common ground(s) the insatiable erected members of the US Political Parties will ever agree on, albeit strictly behind bedroom doors per personal special interests, and in unanimous denial in public.

Epstein's island was truly the off the record Capitol of buy party sin effort.

buy party sin by Handcuffmonkfish October 18, 2019

Uglier then homemade sin 

When a homewrecking wanna be bitch texts another woman's man behind her back and then lies about it, it makes her uglier then homemade sin as a person.

That girl tried showing her "panties" to another woman's man and it made her look uglier then homemade sin.

Uglier then homemade sin by Noresun2noAmy2 March 12, 2022

The Longer the Icon of Sin 

Is on earth, the stronger he will become

Samuel Haiden: The Longer the Icon of Sin is on earth the stronger he will become
Vega: Do you want me to open a portal to Earth?
Doom Guy: *Silent Angry Slaughtering Stare"

The Longer the Icon of Sin by Owl Man May 9, 2020

ugly as homemade sin 

A very southern phrase refering to the act of incest.

"that's as ugly as homemade sin!"

ugly as homemade sin by C. Hardy October 13, 2006

fuck a nigga cos sin 

When you gotta fuck a nigga mathematically.

"Yo he says he's better than you at algebra."
"Yo I'm finna fuck a nigga cos sin."

fuck a nigga cos sin by El Señor June 2, 2017