Iuser
From Scriptwiki
This allows you to set or remove the info appended to a user list entry.
/iuser <nick | address> [info]
If no info is specified, it will be removed.
Example
iuser Dana This is my new info.
This would set a new info about Dana being "This is my new info."
iuser Dana
This example would delete the information about Dana.
See Also
To add a user by his address, use /guser.
You can also remove users from your user list by using /ruser.
To use the information you have stored, use the $ulist identifier.