Top Definition
A Gluteus Maximus Size that extends beyond normal scales of measurement into another dimension.
Guy 1: Did you see that ass? She has had like no waist but a 4XL booty.
Guy 2: Yo man that was Asstronomical!
by Lil Woody January 26, 2015
the study of anal sex
what i did last night
by babyboy001 February 17, 2004

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