something that a person who hasn't had had a BJ yet might say to make it seem like they have. By saying "tastes like cum", it seems like they would know what cum tastes like, when really, they're just saying it.
Emma: Jesus Christ, this milk tastes like cum!
Louise: How would you know what cum tastes like? It's not like you've...
Emma: Shut up
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.