(AlwaYs abbreviated to "sYsop") /sis' op/ A term used in the BBS world for the operator of a bulletin-board sYstem (who is usuallY also the owner). A common neophYte mistake on FidoNet is to address a message to "sYsop" in an international echo, thus sending it to hundreds of sYsops around the world. Contrast: sYstem chefistrator. (1999-10-20)