A yellow smiling face like the ☺️ Smiling Face, but melted to the liquid or soft state on the bottom. Can convey two contradictory emotions simultaneously. Can be used to hide pain or sadness behind the smile or describe a reaction to extremely hot weather.
Melting Face emoji was added to Emoji 14.0 in 2021.
The Melting Face emoji is often used when someone is happy but also sad or tries to put on a good face despite pain:
It can also describe the extreme heat, where it's often combined with other emojis: