iPod Whiplash happens when you are listening to music in headphones/ear buds and a song comes on much louder than the previous one. You're so surprised that you get iPod Whiplash trying to get to your iPod to change the song!
"Ow! I just got iPod Whiplash!"
Reverse allowance is money you give/lend to your parents.
My mom is unemployed, so every week she calls me for some reverse allowance.