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One who loves Umphrey's Mcgee like they would/do their own kid
Kid: Those 3 dudes from Ashwaubenon sure are Umphreaks.
by Darin O December 29, 2007
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Someone who is a hardcore fan of the jam band Umphrey's McGee.
Jim:I just went to my 20th Umphrey's show!!!

Dave:You're such an umphreak.
by Mickey Hart July 15, 2008
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Umphreak (noun): generally, a fan of the progjam band Umphrey's McGee.

When in reference to a male, refers to an Umphrey's fan, who most likely has an embarrassing past history with acne and Rush or, worse yet, Dream Theater. Has since moved on to appreciate musical composition, has garnered respect for jazz, and now washes more regularly with soap.

When in reference to a female, refers to the rare girl with an advanced musical taste, a penchant for stimulating drugs and the inclination to sleep with anyone who knows the words to All Things Ninja. Will shake her ass to the 40's Theme after drinking.
Parent 1: My son sure does enjoy listening to Umphrey's McGee with your daughter. Reminds me of when my wife and I would listen to Emerson, Lake and Palmer and Pink Floyd.

Parent 2: Yes, but I doubt you ever humped your wife in rhythm to all the time signatures in Conduit like those two Umphreaks.
by vomitusmaximus August 13, 2011
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