jumped-up

slang Glorified. The phrase is used to describe someone who acts or is thought to be more important or powerful than they really are. Primarily heard in UK. I can't believe she's trying to tell me what to do, when she's just a jumped-up intern! These days, it feels like the prime minister is nothing more than a jumped-up headmaster.

See also:

eggs is eggs
kicking and screaming
great minds
great minds think alike
(as) sure as eggs (is eggs)
sure as eggs is eggs
from my cold, dead hands
57
Heinz 57
Heinz 57 (variety)

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