I wonder sometime how life would be, if it was no such thing as D
But then I put that Sweet down, cause that bullshit don't apply to me

from UGK (Ft. Charlie Wilson) – How Long Can it Last Lyrics on Rap Genius

Meaning

Contemplates life without cocaine (“D” for dope), but then his mind goes back to the reality where he’s selling drugs because he can’t afford to chase a dream that’s too good to be true

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