The psychological sickness one contracts when Mumfords and Sons backs out as the headliner of the music festival you're attending. Symptoms include, but are not limited to: intermittent frowning, being teased by your peers and randomly storming off in the middle of the show that replaced Mumford and Sons.
"Janet was really looking forward to seeing Mumford and Sons play at Bonnaroo this year. When they were suddenly replaced with Jack Johnson, she came down with a bad case of The Mums."
by Chicketychina11 June 21, 2013
Get the The Mumsmug. by Ok u gay October 25, 2018
Get the Ya mummug. A mum joke is similar to a dad joke, except it either doesn't land, isn't funny, or is trying too hard.
by CallofClicky February 16, 2022
Get the Mum jokemug. by ImATonk April 10, 2020
Get the Your Mummug. by Lucas Pennington September 23, 2021
Get the yarg farg ur mum has a hard yardmug. 
