1. a word used to express a feeling of disbelief
2. a word used when you don't knowwhat else to say
3. an expression showing complete and utter boredom with whomever may be speaking
1. Pshaw! You just made that up.
2. Pshaw...i'm freakin' bored..
3. Pshaw! Just get on with the damn story, i ain't got all day.