jumped-up

Short definition from Wiktionary

Adjective

1. 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.
2. 2
   Having risen from a lowly station or an inferior position, often with a conceited or arrogant attitude.

Verb

1. 1
   simple past and past participle of jump up