Rockin' jeans and thug sandals, that's a faux pas

from Big Sean (Ft. Mac Miller) – Hundred Dollar Bill Skyscraper Lyrics on Rap Genius

Meaning

Faux-pas is french for must not, Mac’s sayin' you better not be wearing jeans and thug sandals because it looks ridiculous.
(Mac’s had a couple french lines in his songs)

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