" is a slogan, owned by McDonalds, so you probably should be dropping ten cents into a jar somewhere every time you say it :-) As for right/wrong, I would say it's acceptable. It has a verb, and a subject and object. IT is not defined without context, but as long as there is context of some kind, that seems like a valid sentence to me.
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familyguyIs it correct to say "I'm loving it!" asIt is correct if it is used in the appropriate situation. It is equivalent to a very enthusiastic "I'm enjoysawseen on TV? Some people say that it is wrong, but people say it all the time...