A Bluecat is a heavy, thick dump taken by someone with a bowel disease. The Bluecat dump (so called because of its clumping ability and blue hue underwater) is indicated by a severe smell upon entry into the bathroom and an inability to immediately flush the toilet.
"That guy didn't even wipe after leaving a Bluecat in the mens' room toilet, second stall. Don't go in there."
by Sandboats August 15, 2007