What does this mean?

I was laying on the couch in the darkness (the tv became boring) and I was trying to do some calculations and when I reached n!/((n-r)!*r!) I got an erection and couldn't calculate in my head anymore, then I when the erection was gone I tried again but the erection comed back. :(

it means you devided by zero and your penis was getting sucked into time paradox