Top definition
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
by green duck butter November 21, 2016
Get the merch
Get the Sin-in-law neck gaiter and mug.
Apr 22 Word of the Day
When you eat dirt for the first time and leave your family to build a shack in the woods
Bro since I got dirtpilled on Tuesday I have made sooo many worm friends and made them soo many little houses to get married in. Me? Lonely? No you’re the lonely one u lawn owning freak
via giphy
by ecogoth December 30, 2020
Get the mug
Get a dirtpilled mug for your dog Larisa.