1) To listen to music on your iPod, iPhone etc

2) To stuff two apples into any orifice
Some idiot was playing music on the bus so loud the other day. I wasn't bothered but my friend was so I told her to whack in a pair of apples...

...He won't be able to walk straight for weeks.
by SubLimeGreen April 22, 2009
mugGet the whack in a pair of applesmug.