jumped-up

adjective2

1. •
   Thinking or acting as if one is superior, as by pretending to be of a higher class or having greater authority than is the case.

   • We're doomed if this wee jumped-up monkey gets Gordon Smith's blessing. — 2007
2. •
   Having risen from a lowly station or an inferior position, often with a conceited or arrogant attitude.

   • You jumped-up, cheap, Coventry bagman, / silk-sampling, no doubt, is your biz — 1895