A progressive metal band that formed in 1985 by Mike Portnoy, John Myung, and John Petrucci. They combine the heavy sound of such bands as Metallica, Soundgarden and Megadeth combined with the musical complexity of Yes, King Crimson and Emerson Lake and Palmer. Dream Theater's music covers a lot of ground, but fans of the band consistenly enjoy all of their music. Some of their well known albums include Six Degrees of Inner Turbulence, Train of Thought, and Octavarium.

1.) a piece of music by Emerson, Lake and Palmer, or the album on which that musical piece first appeared 2.) a mechanical beast resembling a cross between a tank and armadillo 3.) the most awesome/beautiful/powerful thing ever

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.

The rarely seen female prog rock fans. They are mostly known to inhabit Tumblr in a tightly knit community.