empty bucket
Literal meaning: a bucket that contains nothing. Rarely used in modern Japanese; the word is mostly encountered as a pun for karaoke.
karaoke (pun)
Jocular pun on カラオケ (karaoke), playing on the homophony with 空桶 (empty bucket). Used humorously, often in wordplay or casual conversation.
See also: カラオケ
An empty bucket was left by the well.
Let's all go to karaoke tonight! (pun)
Compound of 空 (から, 'empty') and 桶 (おけ, 'bucket'). The humorous 'karaoke' sense is a pun on the homophone カラオケ.