Top definition
A phrase indicating that one doesn’t care about someone’s problem, and feels no responsibility to help fix it. Often used to disguise the fact that while it’s not your problem, it *is* your *fault*.
example 1 (disguising fault):
“Your slanderous article has ruined my good name! I demand that you retract it.”
“Not my problem.”

example 2 (not one’s fault):
Right as I was leaving the building after quitting my sysadmin job, I heard the servers go down again. I didn’t turn back. It was not my problem any more.
by roryokane September 23, 2013
Happy St. Patties Day!
A really annoying string of words that people use when they don't want to admit responsibility for anything.
Sheila: "You used all the gas in my car! How do you expect me to get to work?!"
Jared: "Not my problem."
by MCsquirrel April 27, 2017
Happy St. Patties Day!
Your problem...
a: My girlfriend has run away with some shortarse, chav gobshite from Chelmsley Wood! What should I do?

b: Not My Problem....
by nutwiss December 11, 2011
Happy St. Patties Day!
When you open the fridge, grab something, close the fridge, and hear something fall.
"Not my problem!"
via giphy
by Fucking, MEEEE May 03, 2017
Happy St. Patties Day!