To estimate. To aproximate the total or amount of a value or object.

Derives and is primarily used by persons with below average IQ in place of the actual word "estimate".
I guesstimate my intellegence to be that of a primate.
by Prof. Jonathan D. Kimball January 22, 2005
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A word that teachers and old ladies use to sound annoying, even though it literally means the same thing as estimate.
Student: Can you show me how to solve this equation?

Teacher: Sure! You start with a little guesstimate, and th-

Student: SHUT THE FUCK UP!
by GotAFuckingUsername August 4, 2015
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A combination of Guessing and Estimating you find the guesstimate by:
1. Guess
2. Estimate
3. Find the difference between the two.
4. Add them up
5. Divide by two
6. Plus 17
7. Subtract two
ALL DONE
YAY! I solved the problem by using the Guesstimate Strategy!
by Grace October 9, 2003
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A word used by Dr. Cox from Scrubs.
A guess and an estimate.
"My guesstimate would be that you'd make 100 million $ after the first suscription..."
by ;angeeel. April 20, 2009
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To guess instead of actually using any proper way of estimating, therefore using less effort than estimating
It said to estimate in the math question, but I CBF so I guesstimated
by Lissalicious August 31, 2008
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Teacher: Billy, what do you think will happen to the vinegar when we put in salt? Please do NOT guesstimate.
Billy: It will turn into a dog
by iluvtrolling76 February 26, 2019
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