A contraction of Creationist and retard. Used as a term of abuse for the most wilfully ignorant creationists.
It's usage is largely limited to American English.
VenomFangX is a creotard of the first order.
A sub-human who believes in creation as told in the bible, and refuses to understand or consider any other explanation. All creationists are retards, but not all retards are creationist (i.e. there is some hope for the latter).
IDiots are all creotards.
Discovery Institute is a holding tank for creotards.
If you believe in god you are most likely a creotard.