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1.
A painfully annoying song that gets stuck in your head, in extreme cases, impeding everyday tasks.
I've got "I don't feel like dancing" stuck in my head, it's a real head splinter!!
by TC99 December 26, 2009
 
2.
I don't know what a head splinter is, other than the obvious, but UD should never have approved the previous definition. Everyone knows that a song stuck in one's head is called an ear worm.
Dude 1: Man, I got a head splinter!

Dude 2: Do you want me to get my tweezers?

Dude 1: No, it's a song.

Dude 2: Don't be an idiot, that's called an ear worm!
by calichef January 02, 2010