(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)