Schnapsidee
suɫqimenɐon ʌŋtuŋhɐn sɛŋqɐq sʌlɡɪmiː nɑːɹɒn iːɒŋtiːtʌŋhan siːŋɡak
In Korean 술김에 나온 엉뚱한 생각 (sul-gim-e na-on eong-ttung-han saeng-gak)
A silly, often impulsive or ill-conceived idea, usually thought of under the influence of alcohol.
Example
"Das war wohl eine Schnapsidee von ihm."