What you say when you see one of the most heinous crimes against the english language known to man. It's when an apostrophe is put in a plural noun (WHERE IT DOESN'T BELONG!), therefore indicating that the noun somehow owns something...
sign: BOOK'S FOR SALE!
my smart friend: SHEILD YOUR EYES! APOSTROPHE CRIME!
me: *smacks forehead* So... that book owns a for sale? That's interesting... MY GOD PEOPLE WHEN WILL YOU LEARN!?!?
Eric has a bad case of apostrophitis- he keeps writing things like, "GREAT DEAL'S ON EVERYTHING" and "Available in 12 color's" and "He gave it back to it's owner".
The needless insertion of a silent apostrophe into a place, race or character name in a work of fantasy fiction. The fantasy apostrophe is intended to give mystique and gravitas to an otherwise stupid sounding made-up name. However, it is not always successful in this regard.
Tom - What you reading, Geoff?
Geoff - I've just started the G'dorf Trilogy
Tom - Any good?
Geoff - Well, there's this dude called Kar'El, a J'olara trader from the Ava'pia region. He's got to get an amazing S'word which will kill all his enemies, the Z'Goff.
Tom - Fantasy Apostropheoverload?
Geoff - Lucky I didn't mention the B'Z'or'ef