Swedish Klämkäck (lit. squeeze-dashing)Someone who's a bit too perky, energetic, and positive, often to the point where it feels fake. Think some waiters and the like.
https://sv.wiktionary.org/wiki/kl%C3%A4mk%C3%A4ck
Can also be used about things, like "klämkäck dansorkester" (squeeze-dashing dance orchestra).