Driving so slow but BK is from Texas
He’s driving with Beyoncé (Knowles), who is from Houston, TX. He feels the need to point this out because slowness is associated with Houston-style rap, which is “chopped and screwed”, resulting in a “slow” kind of music.
Also, driving slow aka “Tippin'” is a trend in Houston — it’s considered a way of showing off your fancy rims (while avoiding speeding tickets! Smart..)
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