cass Share definition Flag the biggest piece of shit living on the face of the earth, usually likes girls with names, lisa, nicole, karly, mostly jennifers though did you see that fat motherfucker walk by i swear it was a cass cass by snowboarder85dickfaget January 10, 2009 0 0 Get merch Get the cass mug. Buy Now — $32.95 See more merch