Someone who repeatedly uses old memes, and likes dubstep and mlg, a meme rat's main source of memes is looking up "meme" in the chrome task bar and clicking on images. meme rats usually have small penises.
by Stalin is daddy December 18, 2016

by rat vaio February 23, 2020

A person who so so ethically low that they look for ways to invent an issue with a personal or a company to get money.
Did you hear about that guy that tried to put a cockroach in the tacos so he could sue Taco Bell? Typical sue rat!
by Dontbeajerk March 9, 2017

by haldhob May 21, 2018

A person from Fall River, Mass. Often described as a low-life, piece of trash who makes one's life a living hell to be around.
Colleen: "Man, I had to train this new kid at my other Dunkies. She was a real pain in the ass, couldn't do the simplest of tasks. A true River Rat.
Co-worker: "A River Rat?"
Colleen: "You know, someone from Fall River? They're all the same, never met one I like."
Co-worker: "A River Rat?"
Colleen: "You know, someone from Fall River? They're all the same, never met one I like."
by XxBenny22 March 27, 2023

by Jtjrbebbrbebeb June 9, 2025

Gargle some salt water and take care of that tooth socket. You have Rat mouth. It smells like death when you talk.
by 2rr2lv2rr2dy February 25, 2022
