Definition from Wiktionary, the free dictionary
Fanciful extension of up.
- Presumptuous, above oneself, self-important; arrogant, snobbish, haughty.
- Exceeding one's station or position (see usage note below for one example), assuming prerogatives to which one is not entitled.
- This term has been used in a racist context to describe African-Americans who were considered to be acting above their "rightful place".
Presumptuous, above oneself