But I've seen better punchlines at the prom waitin' for drinks

from Cassidy (Ft. Jin) – Cassidy vs. Jin (Freestyle) Lyrics on Rap Genius

Meaning

Punchline from a prom is fruit punch.
In the music industry it’s the same word “punchline” but different term. punchline is similar to a metaphor so jin is basically saying that your punchlines are bad.

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