African American Vernacular English vs slim thick

African American Vernacular English is a noun but slim thick is not a noun.

Word	Noun	Adjective	Verb	Adverb
African American Vernacular English	Yes	No	No	No
slim thick	No	Yes	No	No

African American Vernacular English (noun)	slim thick (noun)
a nonstandard form of American English characteristically spoken by African Americans in the United States

African American Vernacular English (adjective)	slim thick (adjective)
	of a female with a large bottom and a slim waist