
Literally "mood onion," someone whose emotions have many layers or who is emotionally complex. A more recent colloquial term.
Example:
🇩🇪 - Er ist ein echter Gemütszwiebel - man weiß nie, welche Gefühlslage als nächstes kommt. 🇬🇧 - He's a real emotional onion - you never know which mood will come next.