1. An attempt to describe something by giving a math equation, and the other person missing the point.
2. An error in a simple math equation which is after completing grade 7
Examples:
1. a) In an attempt to explain to a friend that someone liked them I used an equation. U+Them=Love. They looked at it blankly, then I realized it was a failquation.
What results when one takes a trip to visit a long-distance significant other, and said trip does not result in sex.
"How was your trip to Florida?"
"Pretty fail. He didn't want to have sex all week."
"What? Even old people can get laid in Florida! What a failcation."