Check the barometer
Continuing from the earlier part of this song, a barometer measures pressure.
Atmospheric pressure increases alongside the mass of a planet due to gravity. A high pressure reading on a barometer may indicate the reason for his Uzi’s weight.
It is curious that his word choice identifies the cause of his Uzi’s weight to outside pressures, possibly showing that he is still not immune to the expectations of others, or maybe even the needs of survival (he referenced earlier his ability to stave off hunger).
Also a play on words: Jay’s BARometer would be peaking, suggesting that he has bars.
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