noun
one's specialty performance; one's party trick; one's repertoire
Refers to a performance, skill, or routine that a person is known for and can readily show, often in social settings.
彼の持ち芸は手品だ。
His party trick is magic.
宴会で持ち芸を披露した。
I performed my specialty act at the party.
Compound of 持ち (mochi, 'holding, having') and 芸 (gei, 'art, performance'). The exact historical derivation is uncertain, but the word transparently means 'a performance one has at hand'.