Green’s Dictionary of Slang

alley adj.

[the negative stereotyping of a poverty-stricken area, e.g. a racial ghetto]

(US campus) second-rate.

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[US]Da Bomb 🌐 ally [sic] (adj) {offensive} Ghetto; of poor quality. [Oglethorpe University, Atlanta, GA].

In compounds

alley hyp (n.)

(US drugs) an impoverished narcotics user, dependent on makeshift equipment for injecting.

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[US]S.F. Call 27 Nov. 3/1: An ‘alley hyp’ is a low cocaine fiend who uses the cheapest appliances for his hypodermic syringe. He will take a medicine dropper to which a needle is fastened by a band of cigarette paper.