Wiff is a term you use when a move, situation, person, outfit, food, attack or negativity doesn’t effect, hit, doesn’t work, doesn’t impact you or is just a bad mistake.
Wiff Waff is about a 300 year old name for "ping pong" they used a wine bottle cork and called it wiff waff because of the sound it made. they also used cigar box lids for paddles...