Top definition
A horrific event in which one is slammed in the face with such a considerable and inordinate payload of semen that their universe is forever chang-ed.
1) If i ever ran into Brooke Burke on the street, i would drop trou and she would be the direct object of the greatest cumtastrophe the world has ever seen.
2) Sometimes, I just want to go to a Japanese massage parlor. Only problem is...because i love asian women so much, when I get the happy ending, it usually turns into a cumtastrophe.
by Red Baron December 16, 2004
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