an adjective describing a noun that imploys ingenious dialogue and/or content featuring one or more of the major areas of mathematic inquiry: arithmetic, number theory, geometry, probability, statistics, ect.
The play "Eureka" featuring Einstein, Ada Lovelace, Pythagoras, and Pascal was truly mathtastic.
In "Stranger than Fiction", Harold Crick is mathtastic.
A term made up by a math teacher to mean that a person did so well on a project, test, or quiz, that they were absolutely amazing. Only given for 100% and up.
Dude!
What?
I got mathtastic on my test the other day!
Oh wow man, i got a 45 =(