Not conforming to what society dictates, but in a sense marching to the beat of your own drummer
Johnny: "Your gold when your a kid. When your a kid, everythings new. Like dawn, the way you dig sunsets, Ponyboy, that's gold. Keep it that way, its a good way to be."
-Liz stay gold :)
More literal meanings can be to stay where you are, in whatever figurative meaning (ie: relationship, city, state, country) you can conjure up.
Derived from the last line of Robert Frost's acclaimed poem "Nothing Gold Can Stay".
Also a clothing brand, Stay Gold Clothing make some pretty rad tees.
Example 2: You heard of Stay Gold? I just bought a tee off there man!