The 🤤 drooling face emoji expresses intense desire or craving for something tempting, most commonly delicious food. In Gen Z slang, it is frequently used to show that someone is "thirsty" for something or someone attractive.
Usage example
That pizza looks fire 🤤
New iPhones finally in stock 🤤
🔞 NSFW▼
Sexual innuendo (emotion)
Lust. Drooling over someone (often used as a reaction to thirst traps or nudes).