!block is a feature for Chat that allows any user who can block users to block users by entering a simple command in the textbox.
To use !block, the following data must be entered into the textbox:
!block USER | REASON | EXPIRY
To set options for the block, there are 3 additional options you can add to the command:
!block USER | REASON | EXPIRY | disable talk page | disable autoblock | disable reblock
The last 3 options do not have to be in the order you seen, but they must go after the expiry in order to work.