Snooty is an adjective meaning stuck up, snobbish, or arrogant.
It most likely comes from the Scots 'snoot', meaning nose or snout, but it is possible that it comes more directly from 'snouty'. Either way, it first appeared as a bit of college slang in 1918.
Snooty is often pronounced 'snoody'. This is acceptable, and should not be looked down upon.
Brevity Quest 2016