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1 definition by El Delabor

 
1.
Used to describe something or someone as being superior, or excellent.

So superior that it is incapable of being changed from its level of 'greatness', hence "solid"

Like a solid foundation, what is being described as "solid" is so excellent that it cannot be made less awesome.
"Son, those new two-tone kicks are indeed 'solid'!"

"Hey Joe, that new guitar riff sure is 'solid'"

"Check out Captain Cookout's new album! Its 'SOLID'!"
by El Delabor December 04, 2003