Top Definition
Latin for cheerfulness, merriment, good humor
Guy #1: One time, when I was learning to drive, I was passing this guy on the left, and I accidentally put the car in "park" because I thought the "P" stood for "pass." That destroyed the transmission, immediately. At the time, I was doing 80-miles per hour on the freeway.

Guy #2: That's hilaritas.
by noodie noddie April 07, 2011
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