Literally, "first defecation." The act of taking the first dump in a toilet since it was last cleaned, particularly at one's workplace or other public restroom. Prima cacatus typically results in a surprised sense of joy that no one else's ass has touched the seat that day.
Nothing makes me happier on a Monday morning than finding out I get prima cacatus in the men's room.
by IKE60 February 13, 2019
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