Portmanteau of the words sarcoma and orgasm. Meaning a very bad "sarcastic tumor" that has a climax whenever someone says something stupid or idiotic.
If anyone has a relative with a tumor I mean no offence.
Me: *baking a cake*
Billy: *looks in oven* What are you making, M.E?
Me: I'm making a stew of the children I killed, Billy.
Billy: WHAT
Me: SARCASM