tin grin

One who has metal in their mouth.
Commonly referred to as "braces"

"Dat bitch is a tin grin!
lolz"

by BUBBASPARKZZZ November 7, 2007

Perma-Grin

The seemingly permanent smile that someone has after spending time with someone that they are very fond of, or doing something that they enjoy.

Kathi leaves work everyday with a Perma-grin. She must really love her job!

Look at the Prema-Grin that Christina is wearing this morning! I wonder who she was with last night?

by AnthonyOhio August 4, 2007

Chelsea Grin

A form of torture.

Typically, two one inch incisions are made at the corners of the victim's mouth. Then the victim is tortured causing them to scream. This tears the flesh along the sides of the mouth, leaving a "grin".

Can alternatively be called a Glasgow Smile .

Heath Ledger's Joker has a Chelsea Grin.

Ichi the Killer has a Chelsea Grin.

by dirtybird4t46345222 October 19, 2008

Shits and Grins

To do something for no reason other than to have a laugh.

Jo: lets go and see that new film.

Jake: why?!, its crap.

Jo: Just for Shits and Grins.

by viperdick September 9, 2012

evil grin

Mostly common for villains, or people, who doing or about to do bad things on purpose for personal satisfaction.

Also known and a facial expression.

An "Evil Grin" is more subtle than a outright "Evil Laugh" but is still fairly exaggerated so as to make sure a viewer can not mistake it for a normal smile.

"He smiled at us, but the smile wasn't friendly; more amused, like Oh boy, more people to torture!"
- Percy Jackson when he first catches sight of Geryon (evil grin)

by someoneniemand September 18, 2013

Rib Grin

When you eat a shit load of ribs and you have the sauce all over your face

Guy 1 : "Oy man look at the rib grin on that fat guy eating ribs"

Guy 2 : "Geez! That guy loves hes ribs that is the biggest rib grin ive ever seen!"

by timed58 December 10, 2012

IM grin

The tell-tale grin one gets while IM-ing at work or in class. This grin tends to incriminate the IM-er and lets others know that they aren't staying on task or paying attention.

"OMG, LMFAO. Stop it - I've got the worst IM grin and my boss just walked by"

by effchomsky December 20, 2007