Yet again out of http://www.creationtheory.org/Essays/Phrases.xhtml
Big Bang Theory
Normal Person's Definition: “The theory that the universe's ongoing expansion, size, and layout are consistent with a very rapid expansion from a single point in the distant past.”
Fundie Definition: “The theory that the universe came from nothing.”
Note: this has to be one of the most common scientific misconceptions in existence. Virtually 100% of creationists believe that "rapid expansion from a singularity in the distant past" somehow means "something from nothing", even though it means nothing of the sort.