A relatively new arrival (Unicode 14.0, 2021) meaning awkward embarrassment, social anxiety, or being completely overwhelmed — 'I am dissolving from cringe' captures it well. It exploded in popularity almost instantly on TikTok and Twitter as shorthand for secondhand embarrassment or feeling emotionally exhausted, faster than almost any other recent emoji.
Keywords: disappear, dissolve, embarrassed, face, haha, heat, hot, liquid, lol, melt, melting, sarcasm, sarcastic