As a verb: To screw up completely and/or hilariously.
As a noun: A complete failure, referring to a person.
"Alright, I need to take care of this paper before Darius numpts it (up)."
or
"I already know the button inputs, you numpt."
An inversion of YUPE - Not Upwardly Mobile Plummeting Towards Earth, most often used as a joke or humourous critisism (see BANTER)
You flamming NUMPTE how could you be so stupid!
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