Guesstimation 

A guess towards a possible estimation of some sought.

My guesstimation will be for another 3 hours of driving.

Guesstimation by gaetano November 2, 2007

Guesstimation 

When you don't know how much it costs so you make a guesstimation.

According to my guesstimation, this toy would cost $30.
Let's guesstimate how much this would cost.

Guesstimation by CoolioV August 25, 2018

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

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

Guestimating 

Best guess, using formulated approach to vaguely reference any particular set of information.

"From the location and smell of urine from the street, I’m guestimating this housewarming is more like a squat party at a crack house."

"I'm guestimating we'll be ready around 6 o'clock."

Guestimating by Wes Ferguson July 26, 2005

Guesimation 

A guess and an estimation!

Person 1: What was ur guesimation for question 10?
Person 2: 18. Y?
Person 1: Cos

Guesimation by smilesr4free August 22, 2012

Guestimation

A guess and an estimation combined. A word created by a worker at Coke.

The vet gave a guestimation of the dogs age.

Guestimation by Guestimater January 10, 2020