To laugh uncontrollably hard, to the point that your jaw moves up and down after the laugh ends.
"Dude, I read Vice Dos and DON'Ts and it was so hilarious I erupted."

"My boyfriend used Tickle-Me-Elmo on me during foreplay and it was it so funny I erupted."
by Elmoruption December 13, 2009
To say something is mental or crazy
This tidy weekender is erupt as fuck.
by Lanie B January 30, 2008

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