Popping E, I don't give a F, told you I'm a G

from A$AP Rocky – Peso Lyrics on Rap Genius

Meaning

Keeping up the theme of single letters replacing whole words, they are taking some ecstasy to get in the mood for a good party. The A$AP crew do not want to care about their problems.

In terms of the abbreviations:
“Taking [E]cstasy, not giving a [F]uck, told you I’m a [G]angta”

Genius

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