Green’s Dictionary of Slang

acrylic adj.

[the hardness of acrylic paint]

(US campus) hard, difficult, esp. intolerable.

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[US]College Sl. Research Project (Cal. State Poly. Uni., Pomona) 🌐 Acrylic (adj.) Superficial, hard, or generally difficult to tolerate. [Santa Catalina School, Monterey, CA].