what's the difference?
I often heard people say"i am going to dinner outside" or "i am going outside for dinner"
Is there any difference at all?

Question

what's the difference?
I often heard people say"i am going to dinner outside" or "i am going outside for dinner" 
Is there any difference at all?

Answer

hmm. i'm a native english speaker from the nyc region and i haven't heard those expressions. i've heard "i am going out to dinner" (and not "i'm going to dinner out"). it may be different in the uk or austrialia, etc

Answer

I agree with Eld.  It sounds a little strange to American English speakers.  If you say "outside" about eating, it sounds more like a picnic or something.  I always say "I'm going out for dinner."  or "Let's eat out tonight."  Otherwise, I don't have any other expressions for eating somewhere that is not at home.