"The Must" or being "Musty" is a feeling one has after getting really high. It's a feeling one may experience when they feel as if they are watching them selves in third person while still looking through their own eyes.
Bro 1: "yo I got hell high last night and I'm feeling really weird today."
Bro 2: "bro your musty!"
Bro 1: "man that is exactly what it feels like!"
Bro 2: "yeah man you got The Must!"
Bro 2: "bro your musty!"
Bro 1: "man that is exactly what it feels like!"
Bro 2: "yeah man you got The Must!"
by Maxxoushades February 12, 2018
 Get the The Mustmug.
Get the The Mustmug. by mr x September 25, 2005
 Get the mustmug.
Get the mustmug. by Joeyanna August 7, 2007
 Get the mustmug.
Get the mustmug. A phrase normally used when an outsider tells you something crazy that just happened but in actual fact it is a common occurrence in your strange fucked up life and just like any other day.
Phil - "Holy crap! Geoff just tripled himself in the middle of the parking lot!"
Kevin - "It must be Tuesday."
Kevin - "It must be Tuesday."
by Alekso Schmekso June 7, 2016
 Get the must be tuesdaymug.
Get the must be tuesdaymug. needed or truly desirable; essential; also, something that is considered essential or truly desirable
This LEGO set is a must-have!
by Fergiinka March 28, 2010
 Get the must-havemug.
Get the must-havemug. The world's most condescending phrase.
by mcnatty December 10, 2010
 Get the Must be nicemug.
Get the Must be nicemug. by afrosamurai88 June 13, 2011
 Get the must not fapmug.
Get the must not fapmug.