Top Definition
a particularly significant episode in evolutionary history, characterized by the "sudden" appearance of many of today's extant fauna. alternatively, when in the company of drunk evolutionary biologists, it can be used to refer to an explosive orgasm .
yo, did you hear what dan said to that pregnant woman at the darwin party? he kept repeating, "i'm going to have a cambrian explosion all over your face". man, was he wasted.

by safjbab;b April 03, 2008
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