This is a phrase commonly used to yab or insult other people, it is also used for a comeback for literally anything!
Dude 1: You are so stupid
Dude 2: like ur mom
Dude1: You fail in school
Dude 2: like ur mom
Dude 1: who was eating that?
Dude 2: ur mom xd
Dude 2: like ur mom
Dude1: You fail in school
Dude 2: like ur mom
Dude 1: who was eating that?
Dude 2: ur mom xd
by Ur mom noob January 17, 2019
Get the Ur mommug. by Pg foot February 25, 2020
Get the Ur mommug. by BIG ZERO TWO SIMP January 7, 2022
Get the UR MOMmug. 

