Resus is likely misspelled.
Resus has no English definition.
As a verb resubs is
third-person singular of resub.
resubs
English
Verb
(head)
(resub) resub
English
Verb
Related terms
* unsub
References
* Usenet newsgroups: [https://groups.google.com/forum/?q=%22resubbed%22!search/%22resubbed%22]