Originally Posted by
Eli85
Dictionary.com is the furthest thing from the definitive source of the English language (the Oxford English Dictionary is). The key is in your link: Informal English. Dictionary.com includes so many informal and colloquial language, which are not words by the authoritative sources. If you write a paper at any college or university worth their salt, and write the word funnest, it will be circled and marked, "not a word."
As for all the others who throw around "Grammar Nazi," you're just too funny. I guess it's an unrealistic expectation when browsing an English forum for posters to use actual words? This is why society is going down the toilet.