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1. to form a totally uneducated guess, judgment, or opinion regarding the worth, amount, size, weight, etc., of; guess without any clue: to totally pull the numbers out of your ass.

2. to form a totally clueless opinion of; judge with your ass.

–verb (used without object)

3. to make an asstimate.

4. To judge how great ass would look without actually seeing it
1. John got shitfaced the night before big meeting and had not looked over the sales data he needed to know. When he was asked about the numbers, he just farted out an asstimate.

2. I totally under-asstimated the tightness and hottness of Beth's ass under that long, flowing dress.
by Cynep September 14, 2009
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