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The sexual act of cumming on a girl's face on a hot day, your cum will develop a crust immediately, resembling the melted and crusty cheese on a baked product also known as gratin.
It was 42C outside so when Jim came on Holly's face, it became a gratin immediately.
Gratin by BlueBallsBelgium July 26, 2019

Gratin’ Cheese

When your digging and scratching at your itchy, often dirty and sweaty, bunghole and get a little bit of that stank under your fingernails.
I need to wash my finger. Peeeeeeewwww. Gratin’ cheese earlier got under my nails.

Your nails are all dirty braaaaaahhh. You been working in the yard? Naaaahh. I got some bad, itchy hemorrhoids so I was gratin’ cheese. That’s foul braaaahh.

Au Gratin 

In French au gratin is a cheese-topped dish. If you cook something au gratin, you cover it with sauce, top it with cheese (or sometimes breadcrumbs) and brown it under the grill or in the oven. A huge variety of savoury dishes can be cooked au gratin; the most common are vegetable dishes.
Au Gratin
-Boil or steam vegetables (broccoli is a good choice) until just tender and put in a gratin dish (a low-sided oven-proof dish).
-Make a sauce by blending 1oz (25g) flour with 1oz butter over a low heat, slowly adding half a pint (300 ml) of milk and stirring continuously (increase the heat to thicken) till the sauce is thick and creamy. Add grated cheese, French mustard or whatever flavouring you want, and melt in.
-Pour the sauce over the vegetables, grate over enough strong cheese to cover (Cheddar or Lancashire, for instance) and cook under a grill for 5-10 minutes until golden, or 20 mins in the oven at 200 degrees.
Au Gratin by Pirate911 October 21, 2008

liquid au gratin 

A rancid, steaming, liquidy fecal secretion that occurs in the middle of the night, while you are asleep, after you eat a number of raw potatoes on a drunken bet. Said secretion smells like a combination of idaho spuds, raw sewage, and shame. Liquid au gratin is best enjoyed with friends, as you invite them to witness, and smell, your stench filled, mattress-goodness.
Did you get a whiff of Berko's "liquid au gratin"? The smell is nearly as disgusting as what it did to his sheets!
liquid au gratin by A.D. Skinner April 14, 2010

persona non gratin 

Someone so lactose intolerant and/or hardcore vegan that you don't want to hang out with them
I know the big game is tomorrow, but I'm only coming over if Pat won't be there. I'm in the mood for pizza and he is persona non gratin in my book

au gratin potatoes 

More from Urban Dictionary

Plate of Brown 

A plate of brown consists of foods that have little to no nutritional value, and are typically deep fried. A true plate of brown will also be accompanied by a dark soda.
Wanna go to meal hall & grab a plate of brown?
Plate of Brown by Cheddar Craigson September 18, 2020
Word of the Day on October 22, 2026

Larpenomics

When finance content creators rent out fancy cars and flex cash to seem richer than they really are in order to promote and sell their “get rich quick” courses.
Andrew Tate has mastered the field of larpenomics
Larpenomics by Rbois09 October 21, 2026
Word of the Day on October 21, 2026

Palmela Handerson 

Your hand that you masturbate with.
Girlfriend: What are you going to do for the next week while I'm on holiday?

Boyfriend: Have a visit from Palmela Handerson of course!
Word of the Day on October 20, 2026
x:"Girl your fit chewed today!"
Chewed by iod1o March 30, 2022
Word of the Day on October 19, 2026

Blue Movie 

A pornographic film.

The use of the word "blue" to refer to sexually explicit content was first recorded in Scotland in 1824. "Blue" meant "lewd" because prostitutes dressed in blue gowns.
I found your stash of blue movies under your bed.
Blue Movie by Shayde79 January 20, 2011
Word of the Day on October 18, 2026
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