When a group of horny drunk guys grease themselves up in butter and jerk off to pornography together for a long amount of time. Usually is a playful, and yet rough and violent act. It can also define as 2 fat people or crack addicts participating in marathon sex.
Logan walked in on his suitemates participating in a scumathon, he gasped because there was cum, shit, and blood everywhere.
by Lupinve Devine October 25, 2006
Can you define these popular missing words?