Top Definition
A term used to decribe a homosexual male, ie butt pirate, poof, Starfish Trooper.
That guy who works behind the bar here is a fuckin arsetronaut
by Scoundrel June 27, 2004
1 more definition
An arse of astronomical proportions
That guy is such an arsehole that he is out of this world. in fact, you can call him an arsetronaut!
by theanglingaddict February 24, 2015

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