'badassed' originates from English, specifically the compound 'badass' with the past-tense/past-participle suffix '-ed', where 'bad' originally meant 'bad/ill' and 'ass' (literally 'donkey') was used in slang as an intensifier or to refer to a person (later shortened to mean 'butt' or to intensify an adjective).

'badass' emerged in mid-20th century American slang as 'bad-ass' meaning a dangerous or nasty person; over time the term was reinterpreted more positively to mean someone or something tough, impressive, or admirable, and the adjectival/verb forms (including 'badassed') developed by adding ordinary English suffixes.

Initially it meant 'a person who is dangerous or morally bad' (negative), but over time it evolved into the positive/admiring sense of 'tough, impressive, or cool' used in modern informal English.