To "blurt something out" means to just say it without much (or any) thought. A hoax is a lie or false situation that is intended to fool the public.
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Lucus Ong
Blurt out:
A person of good English proficiency can blurt out his ideas in English easily.
hoax:
The promosion of buying a modem at one hundred Ringgit off by signing a contact about using the line of the company for two years is just a hoax.