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1.
A festival started by a vision from god given to Dave Mustaine of Megadeth to have the best metal bands of today play at one festival together, each band is different from one another and brings their own genius to the stage. My personal favorite bands that were their include; Megadeth, Dream Theater, Anthrax, Fear Factory, The Dillinger Escape Plan, Nevermore, and Symphony X.
While Dave Mustaine was drunk he saw a vision of Droogie's and She-Wolves moshing to the greatest festival known to man. He would call it Gigantour named after the 1960's anime "Gigantor".
by till_deth_do_us_part November 24, 2005
 
2.
overly huge; really big
Dude: dude, that was gigantour
by ryan543 June 28, 2008