Rat 

a gang sign of rival or unliked gang or crew.

lyrics from Foolish - I got the 45 with me feat. Dj Down South
<Dj Down South>
Hater flash a Rat no i dont take dat///
Pull out my gat go tatitat tat

Rat by Dj Down South of the rap group Project X August 13, 2006

rat 

(same sound as a word rat in English)
1. Thai word for a rhinoceros
2. Thai slang term for a lecherous or lustful woman/girl.

Thummai ter mun charng rat yarng-nee? = Why you are look like a lustful girl?

tammai = why
ter = you
yarng-nee = like this

rat by kkrit ilovewasa November 12, 2006

Rat 

used to refer to something disgusting, shitty, dirty, or otherwise undesirable.

Used and understood in small towns such as Milton, Ontario.

rat, ratty, rat-tastic, rat tatty, rat bag, etc.

That shit was so rat.
Check out her hair, it's so ratty.
You're such a rat bag.

Rat by Robinator December 28, 2007

rat 

Any spawning non-player characters NPC that exist in massively multiplayer games MMORPGfor the human player to kill. Generally low ranking baddies who are quite easy to kill. Take off on the classic first enemy of so many role playing games RPG, the (nearly) harmless sewer rat.

The act of killing rats.

5 rats just spawned near me, help me waste them!
These rats drop some nice loot!
"What you doing?" "Oh, just going to rat a while."

rat by Daemonwell September 2, 2008

rat 

A snitch or a liar/thef. Someone who is untrustworthy

That dirty rat called the cops

rat by monkeysrock June 4, 2015

rat 

a rat is someone who’s a ugly bitch who snitches
Can also be used upon yourself as another word for “I look bad today or looking ratchet

Ex1
Person 1-“she is such a rat for snitching”
Person 2-“I agree! She’s such a Ratchetbitch!”

Ex2
Person 1- “ugh! I look like such a rat today!”
Person 2- “no you don’t! You look great!”

rat by milkk drinker January 23, 2018

Rat 

People at my school who don’t know how to shut up. A rat is basically someone you don’t like at all.

Your a rat stop talking.
Go away you rat omg your making my brain hurt!

Rat by not your homie December 11, 2018