A Roomba is a robot vacuum that cleans for us humans. At times it may rebel and begin to kill their owners. Occasionally people are Roombas in reality.
The act of deliberately pulling down your shorts and taking a shit while swimming in the ocean. Bonus points for wearing black trunks, and pointing your pale ass out over the water while shitting.
I heard that the killer whale shows its face when a person eats pastrami chili cheese fries and goes out surfing...