Guestamation 

A guess that is an estimation. used mainly in cosmology. Very simple.

I have a guestamation there are about 3 trillion stars in the milky way...But thats just a guestamation...:)

Guestamation by Bobbilicious December 2, 2009

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

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

questamation mark 

The use of both an exclamation point and a question mark together to convey astonishment.

When texting/emailing....
Friend one: I can't believe he hasn't called me!
Friend two: I know! WTF?!
Friend one: Seriously?!
When speaking...Oh my God *questamation mark*

questamation mark by Abigail_BP November 8, 2007

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