Questimation Mark 

The punctuation mark in which there is one or more question marks followed by one or more exclamation points. Usually used for emphasis.

Usage of Questimation Mark:

-- WTF?!?!?!

-- OMG REALLY????!!!!!????!!!

Questimation Mark by What's-her-face! December 30, 2010

Questimation 

One who replies to his or her own question with a
questionable estimation.

Tyrone: Hey Jaquantay, how much do they pay at Popeye's....?

(waiting less than 1 second for response)

Tyrone: ..... Nevermind, I think they pay $25 an hour.

Jaquantay: You crazy! You gotsta stop wit 'yo questimations.

Questimation by flux321 July 8, 2009

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

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