Top definition
A homosexual male who seeks out males who have never engaged in homosexual activity.

A homosexual male who has gone where no other fag has gone before.
Bruce has hooked up with so many heteros that everyone calls him a fagstronaut.

Dude, do you see that straight dude over there? I'm going to earn my fagstronaut wings tonight.
by the real el dangeroso September 09, 2009
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