Green’s Dictionary of Slang

schtick n.

also schtuck, shtick, shtik, stick
[show business jargon shtick, one’s stage speciality, one’s act, esp. of a comedian’s monologue; ult. Ger. Stück, a piece]
[1950s+] (orig. US)

1. a personal habit or trait; a speciality.

2. an act, a performance.

In derivatives

schticky (adj.)

[1990s+] artificial, contrived.