
Literally "schnapps idea," refers to a plan that seems brilliant when drunk but is actually ridiculous. Originally from the 19th century when schnapps was a common drink among working classes.
Example:
🇩🇪 - Das war wieder eine typische Schnapsidee von ihm – um Mitternacht schwimmen zu gehen. 🇬🇧 - That was another typical drunk idea from him – to go swimming at midnight.