Kick
From Scriptwiki
Kicks a user from a channel with a reason.
/kick <channel> <nickname> [reason]
Note: You can only kick one user per command. To kick more, you need to send several kick-commands. If no reason supplied, <nickname> will be the reason too.
Example
Kicks the user "foobar" our of #help.script
/kick #help.script foobar
Kicks the user "foobar" out of #help.script with the reason "Spam isn't allowed here".
/kick #help.script foobar Spam isn't allowed here