What would the s stand for on clothing in speak?

In "speak" (the slang language used in the movie "Clueless"), "S" would likely stand for "Super" or "Sweet".

It's important to remember that "speak" is a fictional language and not a real language. The meaning of "S" in this context is based on the movie's interpretation of how teenagers might talk.

Here are some examples:

* "That outfit is S!" (Meaning: "That outfit is super cool!")

* "You look S today." (Meaning: "You look really good today.")

Ultimately, the meaning of "S" in "speak" is up to interpretation, but those are the most likely meanings based on the movie.