Nostradumbass would be someone who thinks they can predict the future, but is too much of a dumbass to get it right.
Her: Whatever, Nostradumbass!
2. Someone who is unable to reasonably assess the direction of a given situation.
2. "You didn't see that one coming nostradumbass!"
2. An annoying know it all dumbass.
3. Windbag who thinks they have a vast knowledge, but really doesn't know much about anything, but has to state SOMETHING.
meanwhile you've both been standing in it for a full minute.
"no shit nostradumbass!"