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1.
An administrator of a UNIX or Linux box. Someone you don't want to tamper with.
StupidUser:

bash-2.04% write root
I will hax0r j00r r00t! w00t!
EOF

Admin:

bash-2.04$ write StupidUser
Okay, go ahead.
EOF
bash-2.04$ userdel StupidUser
bash-2.04$ rm -rf /home/StupidUser
by EagleRock June 04, 2003
 
2.
v. To hack/penetrate/admin a machine - most commonly a datacenter system. Commonly used as an xDCC or FTP server because of its fast connection.
Three of my r00ted machines just came online.
by CH-ris October 20, 2003