Skidd is an abbreviated singular version of Script Kiddie
Skidd is reminiscent of a skid mark in your tighty whities, so shortening Script Kiddie to Skidd is a natural transition, since a Script Kiddie is nothing more than a shitty skid mark on the internet anyway.
But see Script Kiddie
for a more indepth definition.
Damn Skidd thinks just because he can download a few scripts and run them that he's a freaking legendary hacker.