Top Definition
Another in a long line of slang terms referencing male homosexuality.

The catenation of Proctologist and Astronaut.
Alas, the life of a proctonaut was not for him. You see, during a particularly energetic masturbation session, he launched a payload of his own manthrax directly into his open mouth. In retaliation, he immediately projectile vomited it right back at his crotch.
by -Awesome- February 13, 2006
5 Words related to proctonaut

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