Green’s Dictionary of Slang

fake adj.

(US campus) bad, disappointing, negative.

Online Sl. Dict. [Internet] fake [...] adj 1. displeasing. (‘Man, that was fake!’).

SE in slang uses

In compounds

fake-ass (adj.) [-ass sfx]

(US) fraudulent, fake, trying too hard, disappointing.

[US]Too $hort ‘Cusswords’ [lyrics] Played-out fake-ass simple simon / I never understood one word you said.
[US]W. Shaw Westsiders 273: I got a fake-ass family. They’re as fake as fuck.
Urban Dict. [Internet] 6 April: wanksta – A fake-ass foo trying to be hard.
fake bandager (n.)

(US Und.) a beggar who poses as a cripple to elicit sympathy.

[US]I.L. Nascher Wretches of Povertyville 110: The ‘fake bandagers,’ who pose as cripples, go to the shopping district, where they work upon the sympathies of the women.