This is used when someone asks a very important question. It is the use of a question mark and an exclamation point.
Mary, are you pregnant?!
No but that was a good use of a 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:
-- OMG REALLY????!!!!!????!!!