That's a whole lot of naked. ne anlama geliyor?

Bir çeviriye bakın

This sentence isn't actually grammatically correct, but it's funnier this way, because of the way "naked" is just one word. Monica chose the word "naked" because she was quoting Chandler's sentence.

That = being naked the entire weekend

"A whole lot" means "a lot," but it has extra emphasis and shows she is trying to be funny. Maybe you can translate this as adding さ in the middle and よ at the end. Like それってさ、～～だよ。

That's a whole lot of "naked" = That's a lot of nudity.