1 definition by Superman Fast
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."
"Im going to megacum all over you."
by Superman Fast November 1, 2018