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The act of busting an extremely gargantuan size nut, most likely spraying on everywhere and everything in the process. Usually resulted from abstaining from anything sexual for large amounts of time.
"Dude I watched the hottest video last night I megacummed everywhere."
"Im going to megacum all over you."
by Superman Fast October 31, 2018
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2
An event of a of a gargantuan magnitude. Something commanding a great deal of awe.
Dude, going to that concert was more awesome than megacum.
by Elmo4life March 06, 2011
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