A exclaimation, mostly used in written form. Used to convey a feeling of excitement, satisfaction or joy. Has been described as the new w00t, however is not as popular.
Derived from J. K. Rowling's fictional creature, the Fwooper, which sings an (at first) enjoyable song which eventually drives the listener insane.
Repetitive use of the word "Fwoop" has the potenial to do the same thing.
A fwop is a wayward section of hair that flaps on someone's forehead, seperate from the rest of the hair. Usually occurs with older men who have fairly long,shaggy hair - even though they are slightly balding.
Example: " Man, that old guy's fwop drives me insane. I just wanna go over there and comb it back. "