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Random
When you do really good at some maths and it feels like you just exploded in your pants a little because of how awesome the maths you just did was.
Alex: When I discovered the equation for the sum of a sequence I had an extreme mathsgasm.
The orgasmic feeling of excitement one may feel once someone has discovered something mathematical
Person 1: "because you square it, there are 4 answers rather than the conventional 2."
Person 2: "omg i think i just had a mathsgasm."