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2.
Someone who takes an unhealthy interest in everything. Also called an Everything geek. See geek.
Martin knew everything about Star Wars, wood, trains and famous Puerto Ricans. His brother sighed, having an omnigeek in the family meant a lot of time wasted listening to energetic rambling.
by Zacharias Bell September 29, 2008
 
1.
A person belonging all fandoms and groups of geeks; a fan of all geeky things; the ultimate geek; übergeek
Person 1: You really are a gamer geek.

Person 2: Among other geekdoms, yes. I'm an omnigeek! I love all kinds of geeky stuff.
by glossophile November 17, 2013