Morgan Freeman and 21 Savage said it best: "A 'rat' is a traitor, a conceiver, planner or physical participator. He doesn't sell secrets for power or cash, he betrays the trust of his team or his family hoping to save his own cowardly ass...The difference between a snitch and a rat is, at least a snitch is human, but a rat is a fuckin' rat, period" (Snitches & Rats Interlude).
If someone calls you a rat that means that they think your annoying,gross and messy all the time and you should take a shower
Guy 1: rat!
Guy 2: whatever dude (¬_¬)
A person who is stupid and doesn't have basic knowledge.
Person 1: I don't need to know about real world problems.
Person 2: You're a rat.
A beautiful rat is a friend who's a rat just like me. My cousin is a fine example.