noun
successful performance; hit act
Refers to a performer's signature or reliably crowd-pleasing routine, often in comedy, rakugo, or variety shows.
彼の当たり芸は、いつも会場を爆笑の渦に巻き込む。
His signature act always sends the audience into fits of laughter.
このコントは、ベテラン芸人の当たり芸として知られている。
This skit is known as the veteran entertainer's hit routine.
十八番 is a broader term for one's specialty or party trick, while 当たり芸 specifically refers to a performance piece that is a guaranteed success.
Compound of 当たり (hit, success) and 芸 (performance, art). The exact historical derivation is uncertain, but the word likely emerged in show-business contexts to describe a performer's most reliable act.