Green’s Dictionary of Slang

acrylic adj.

[the hardness of acrylic paint]

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

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