sin master 

Another colorful way to describe the male member; in some instances, quite eloquently.

I introduced her to my sin master last night

sin master by Travis D August 16, 2007

Sin hole 

The Vagina.

After having a boy suck him off unknowingly, Petey the Catholic Priest stick it in a nun's sin hole.

Sin hole by Douchebag82 April 23, 2011

Sin City

City Nicknames most held sacred to Las Vegas Nevada, and Lynn Massachusetts.

Gang shootings happened last night in both Sin City's, there's a reason they're called "Sin City"

Sin City by LBR4478 October 1, 2006

Sin-in-law 

The relationship a boyfriend has to his live-in-girlfriend's parents.

Girlfriend: Mom, Andrew and I are moving in together

Mom: Oh, you're going to live together before marriage? Great, how I've always wanted a SIN-IN-LAW.

Girlfriend: But we love each other!

Mom: That's great, your love can help keep you warm right alongside the BURNING FIRES OF ETERNAL DAMNATION

Sin-in-law by green duck butter November 21, 2016

Sin π 

Used by people as a clever way to say "Senpai" because.... I actually don't know why.... they just do it because it makes them sound clever as it's a mathematical phrase. If you see someone mention this then they most likely stole it from Reddit so if anyone somehow get's extremely popular by saying this at school or other places then you know where they got that from.

Jimelf: "Notice Me, Sin π! HAHAHAH I'M SO FUCKING FUNNY HAHAHA"
Agent: "FBI OPEN UP!"
Jimelf: "Oooopsydaisy I think it's the feds I must hide!"
Agent: "Open this fucking door you retarded twat" *Breaks down door*
Jimelf: "STAND BACK I AM A CLASS 6 WEEB!"
Agent: "FUCK! CALLING FOR HELLSTORM ON COORDINATES 41°24'12.2"N 2°10'26.5"E"
Jimelf: "Ima kuso inbu o bakku sutando" *Shoots some fireball or some shit*
Agent: "AHHHHHHHHHHHHHHHHHH" *Dies*
*Hellstorm missile 40 metres from the ground*
Random AC-130 missile: *hits Hellstorm missile and creates massive boom*
Hellstorm missile: *Bounces of the other missile and hits the sun and the sun explodes and kills everyone and the earth turns flat*

Sin π by ExpertOnEvrything69 December 20, 2018

sin-eater 

Someone who take other people's sins or misdeeds, darkening their souls so that the soul of the others remains pure.

Johnny I am your sin-eater. Whatever problems you face, I'll make it my own.

sin-eater by Noobmaster99 May 16, 2019

Sin B

AKA: Hwang Eun-bi
One of the most lovable members in Gfriend!!!
She is the main dancer in her group !!!
she can win your heart without trying!!!

Sin B is really pretty!
Sin B is a dancing machine!

Sin B by Gfriendfan June 9, 2018