geustimate 

its a cross between geuss and estimate, for all those times you really have no idea of the outcome of a situation. an estimated geuss :D

"i would geustimate that in this situation it will work!!

geustimate by ^<(jamie)>^ August 6, 2006

guestimation

A guestimation is an entirely useless term that resides between guess and estimation.
Know>estimate>guess>unknown

Dude 1: My guestimation is about $1,500 for that car.
Dude 2: ?

guestimation by Transpolar Drift Stream July 20, 2011

Guesstimate 

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.

Guesstimate by malcom jamal warner January 18, 2007

guesstimate 

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.

guesstimate by drew s April 8, 2004

Guesstimate 

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)

Guesstimate by Coerce1 May 17, 2009

guesstimate 

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.

guesstimate by isabelle.g.p33 September 11, 2011

guestimation

Half way between a guess and and an estimation.

Guy1: You were right! Edouard really is an idiot!
Guy2: So, my guestimations were correct! I knew it from the very beginning!

guestimation by Raffik October 27, 2007