Slang "kickin' it" (= "chillin'")

[William Salmon]

>     "Kickin' it" ( = "chillin'") is new to me.  What is its original
> reference?  I.e., what is being figuratively kicked here?  And does
> this expression appear in any dictionaries of slang?
>
> Gerald Cohen

At least to 1992 with Dr. Dre's 'The Chronic' album (which also happens
to be cited in the OED as the earliest source for 'bootylicious').
Undoubtedly 'kickin it' appears well before 1992 though.

Also 'kickin shit'.

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