party trick; performance at a drinking party
Refers to a light, entertaining performance (song, dance, joke, etc.) done at a drinking party or informal gathering, often in a tatami room setting.
He performed a party trick at the banquet.
I learned magic tricks as one of my party pieces.
Compound of 座敷 (zashiki, 'tatami room') and 芸 (gei, 'performance, art').