Same Difference...?!?

Same difference? what does it mean?

A lot of people asking what really does it mean? i look at the internet what the other people say about this and here's what they think it is.

• if someone said to you, 'Do you want to watch the movie before we eat?' You could reply "same difference to me" meaning it won't make any difference to you because you don't see what difference it would make.
• like if you say potato and patato.. its like same difference. 

• It means the same thing. They are both equal.

 Now, what do you think?