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1.
Philadelphia tradition: grown men dress like women and bums get wacked on drugs and booze, play banjos, tubas, and flutes while running through the streets causing mayhem. The mummers are divided by brigades, fancies, comics, gays, trannies, post and pre op transexuals. Mummers are known to take a full year to make thier costumes. Women are prohibited from becoming mummers. Sexual relations between the mummer men is commenplace as there judgement is often so impaired during the parade. Most mummers are Eagle fans.
I watched two drunken mummers blow each other on new years day!
by A Palumbo August 27, 2007
 
2.
Someone who gets dressed up during the Christmas holidays and goes from house to house bumming drinks. A Newfoundland Tradition.
Any mummers 'loud in?
by Buddy Wasisname September 18, 2005
 
3.
A member of a travelling troupe of actors originally from the British Isles that performed seasonal folk plays. They occasionally perform in the streets, although their more usual style is house-to-house and in public centers. They are also known by other names (mostly regional) such as rhymers, pace-eggers, soulers, tipteerers, galoshins, and guisers.

The word & concept was recently brought back into American pop culture's attention with the 1997 release of Loreena Mckennitt's hit song "The Mummer's Dance" on her album The Book of Secrets.
Cindy: Oooh! This song is really nice! What's it called?

Hairstylist: Yeah, it's called "The Mummer's Dance". It's by Loreena Mckennitt.

Cindy: Ah. What's a mummer?

Hairstylist: I... don't know. I've never even heard the word before I listened to this song.

Genial Irishman: They're travelling actors, me fair lasses.

Cindy & Hairstylist: Oh... Like, awesome!
by Vampiro413 August 07, 2009
 
4.
Describes mother-to-son fellatio.
"Dude, if your Mom made you wear a dress or something as a kid, or gave you one of those mother/infant blowjobs to ease your colic, I’m sorry. ... Someone needs to show the things he writes to his Mom, and see if she approves. But then, he] would probably just fake a colic-y cough in hopes of getting another Mummer." - Kevin Smith
by DarrenBaker November 28, 2005