A person who constantly gets in trouble by breaking the law, lying, cheating or slacking off and expects everyone around them to take the blame for those offenses. A rat usually gets away with it by accusing others of offenses to push blame off of themselves (these are usually lies).
A rat will also take credit for anything positive, such as the hard work and accomplishments of others and when they get caught they are the first to call others a rat in order to place blame on others.
A rat never takes the blame for his/her actions, and they will fight tooth and nail to prove their innocence and escape justice.
A rat pollutes the neighborhood, workplace or any other environment, making it unlivable for others.
A rat will also take credit for anything positive, such as the hard work and accomplishments of others and when they get caught they are the first to call others a rat in order to place blame on others.
A rat never takes the blame for his/her actions, and they will fight tooth and nail to prove their innocence and escape justice.
A rat pollutes the neighborhood, workplace or any other environment, making it unlivable for others.
Jo: Look at all the work I did, this place is spotless!
Lila: You sat on you ass all day and left trash everywhere! This place is a rat's nest.
Jo: You effing RAT!
Lila: You sat on you ass all day and left trash everywhere! This place is a rat's nest.
Jo: You effing RAT!
by TPFQ fan July 1, 2019
Get the ratmug. Someone who informed one who enforces rules, codes of conduct, laws etc. about another who has broken any of the above.
by Lxver Bxy May 7, 2020
Get the Ratted onmug. by Ashmeedel February 21, 2023
Get the Ratmug. 
What fans of Adam Driver call themselves. Refers to the line Adam (angrily) delivers in an old SVU episode: “You’re supposed to feed the rats on schedule or they get SICK!”
by Suzgav March 12, 2021
Get the Ratmug. by youaclowninghoe May 7, 2020
Get the Ratmug.