Top Definition
A person who gazes at the female ass and who observes with detail how the ass moves when walking. An asstronomer also tracks the tail as it passes by.
Matty had to study Uranus before he was considered to be an asstronomer.
by smatty21 March 30, 2010

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A proctologist who is so very into his profession, quite likely because of himself being gay.
God I went to the proctologist today and man, he wouldn't finish checking my ass for 6 hours already! What an asstronomer! Next time I go see a proctologist, I should ask him if he's gay or else if he is I won't let him examine my ass.
by Mark H June 11, 2004

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(n.) a person, usually a man, who is interested in the field of ass (usually female).
herbert was an avid asstronomer; he could determine the exact gravitational pull of an ass just by looking at it.
by carlos c March 03, 2008

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt