Mathtarded
The inability to perform basic mathematical calculations.
"Hey, can you help me figure out the tip on this bill? You're the only one here who's not totally mathtarded."
mathtardation
The state of being wholly incompetent with mathematical functions.
My mathtardation is atstounding. How do you do prime factorization?
Mathtard
Someone completely devoid of any semblance of math skills. Likely going to major in some liberal arts/language program and earn a paltry salary, regretting their childhood.
Kristi was quite the mathtard in class today. She thought pi was somewhere between 2 and 3.
mathtarded
The complete inability to perform basic mathematical functions. This can be caused by a long lapse in time between math classes causing brain atrophy, or general retardedness.
I am completely mathtarded in my college algebra class, probably because i haven't taken a math class in three years.