bad-assˈbad-ass adjective [only before noun] American English informal 
1very good or impressive: 
bad-ass biker gear2a bad-ass person is very determined and does not always obey rules – used to show approval: Johnson plays this bad-ass cop named O'Riley.—bad-ass,—badass noun [countable]
1very good or impressive: bad-ass biker gear2a bad-ass person is very determined and does not always obey rules – used to show approval: Johnson plays this bad-ass cop named O'Riley.—bad-ass,—badass noun [countable]