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10.
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 August 31, 2008
4 14

1.
The way stupid people say "estimate". They either think they're being cute or clever, or else that it's an actual word. Since it's not any of these, science has yet to offer an explanation for people who consider use of this word acceptable.
My college trig teacher asked us to "guesstimate" values. I wanted to punch her in the mouth.
by October 18, 2005
239 170

2.
An educated guess. A guesstimation is a guess, but at the same time an estimation.
I guesstimated that 95% of people in Zimbabwe think this word is cool.
by April 08, 2004
173 104

3.
a half-assed job at estimating.
Because I'm not very smart, i just guesstimated instead of actually thinking about it and making an estimate.
by January 16, 2007
106 44

4.
1. Originally used by morons who like to make up words, guesstimate is a combination of two words that don't mean quite the same thing; A combination of the words Guess and Estimate that has adopted the meaning of the word guess.

2. To Guess; To draw a conclusion with little or no reason to believe so.
Bob: How high are we on this building?
Mark: I'd say about 10 stories.
Bob: That sounds like a good guesstimate.
Mark: (Silent in awe of Bobs stupidity)
by May 17, 2009
74 38

5.
an aproximation; an annoying phrase likely originating from high school science teachers.
Don't know the answer? Make a guesstimate.
by May 01, 2003
94 63

6.
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 January 21, 2005
68 50

7.
a mix between guessing and estimating.

guess + estimate = guesstimate

its that simple.
me (looking at very confusing non-digital watch without any numbers): I guesstimate that it is about 3:06ish.
by May 23, 2011
9 4