sercisly Share definition Flag A retarded way of spelling seriously. Often used by complainers who hate changes. but sercisly its ****. its 1 active down and all i see now are people reloading before going into a fight. sercisly by aHughez June 27, 2010 0 0 Get merch Get the sercisly mug. Buy Now — $32.95 See more merch