When I pull up I betta feel like a chin up

from Los (Ft. Lola Monroe) – King Los Lyrics on Rap Genius

A double metaphor
1) When he ‘pull up’ in one of his whips, he feels like an important person with his ‘chin up’.
2) When you ‘pull up’ on a bar (working out), you’re head is supposed to be pass the bar; which is why it is called a ‘chin up’.

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