1. plussed - Adjective
2. plussed - Verb
plussed
simple past and past participle of plus
plussed (not comparable)
(computing, informal) Containing a plus sign.
(informal) Calm, collected and unconfused; not nonplussed (“bewildered, unsure how to react”).
(informal) Bothered, fazed, vexed, or concerned; not nonplussed (“unfazed, unaffected, unimpressed”).
Source: en.wiktionary.org