When a man commits some type of sex act that is not only illegal but a sin as well and is able to finish what he started by ejaculating inside of or on his victim.
The pastor of the Catholic Church of sister Mary was extremely horny, so he took the alter boy into his office so he could empty his ball sack. The pastor committed an act of Sinsackencum!
An individual whose very presence lowers the tone in the room. Will complain about almost anything and will dress in plain, understated clothes. The human equivilent of Eeyore from Winnie the Pooh.
"Hi everybody. Hope you're feeling better today than I am. Still can't find my Prozac anywhere, I'm getting really worried now. Must the Sun rise every morning in the east? Why can't..." - ad infinitum.