misunderestimate 

a word made up by jenna pisarev. or george bush. further inquiries will follow.

midterms are so expensive! i always misunderestimate.....

misunderestimate by your love. February 21, 2009

missunderestimated 

Proper hard! Like ultimate boss level difficulty

I missunderestimated this task!

missunderestimated by RubberDingyRapidsBro June 14, 2024

misunderestimation

being almost right about an estimate derived from President George W. Bush.

The President made a misunderestimation about the budget.

misunderestimation by Coop Dupe June 11, 2018