"Dost off top head" is not a word or phrase that makes sense in English. However, we can explore antonyms for the word "off" and "top" separately.
The antonym for "off" is "on," which implies a connection, attachment or inclusion. For instance, "on the table," "on the team," "on the phone."
The antonym for "top" could be "bottom," "base," or "underneath," indicating a lower location. Examples might include "bottom of the stairs," "base of the mountain," or "underneath the desk."
While "dost off top head" doesn't work as a phrase, we can use its component parts to identify opposite meanings for "off" and "top.