Top Definition
A committed, even fanatical, player of Halo 3, a game.
"Young Fred has become a complete Tri-Halonaut since the damned game came out," bemoaned his Mum, already inured to seeing her boy briefly at meal-times, "and it's only been on issue for a few days!".
by Railtracksurvivor September 29, 2007
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