(idiomatic, pejorative) Describes a person who thinks or acts as if he/she is superior in some way that the speaker disagrees with. For instance, pretending to be of a higher class or having greater authority than he/she has in reality.
Example: 2007, Nov 27. Scott Murray, writing in Guardian Unlimited. Stuttgart 3-2 Rangers
We're doomed if this wee jumped-up monkey gets Gordon Smith's blessing.