Cereus Share definition Flag the answer to any question can be this word, it is derived from the word 'serious' and was created by the elite tripod. "yo man your a loser" "cereus" "man this girl is fit" "cereus" Cereus by the Judge January 21, 2005 0 0 Get merch Get the Cereus mug. Buy Now — $32.95 See more merch