Top Definition
the study of the movements and relative positions of celebrity butts interpreted as having an influence on human affairs and the natural world.

I am studying a paper on Kim Kardashian for my Asstrology class, in my bathroom, with my buddy, Dick.

Asstrology suggests there will be 7 planets left when I'm done with Uranus
via giphy
by Michael de Nostradanus January 05, 2016
The act of making educated predictions about whether or not the girl has an ass. Using deductive reasoning to predict quality of ass.
The girl sitting next to us looks like she has a nice butt. I can't for sure tell though. Asstrology
by raleigh99996 October 19, 2011
The practice of pulling horoscopes and other as(s)trological information out of one's rear.
Don't bother with your horoscope, it's just asstrology.

My friend checks the asstrology column in the newspaper every day.
by Rilcis January 21, 2011
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