This is the 9834th most frequent Polish word.
adm
"Adm" is not a standalone Polish word; it is likely an abbreviation, such as for "admirał" (admiral).
Adm is used colloquially as a verb, meaning 'to admire'.
Adm tego, jak pięknie malujesz.
I admire how beautifully you paint.
Adm is used as a shorthand for 'admin' in the context of server administration.
Możesz mi podać adm do twojego serwera?
Can you give me the admin of your server?
Adm is a username or nickname, and does not have a linguistic meaning in this context.