I cannot believe it. or "That will blow you away." Something is very exciting or surprising. The exploding head can also be used to express shock or awe.
The exploding head emoji was introduced in 2017 and released as part of the Unicode 11.0 standard. This emoji can be found under the smileys and emotions category. Because the exploding head emoji has been around for quite some time, it should display correctly in the majority of operating systems.

Here you'll find a range of emojis on how they will look using different operating systems. Each company will design an emoji according to their own style. Here we have listed the most popular platforms around to see how the emoji will look on their screens.

Short Codes:

:exploding_head:

Hex Code:

🤯

Decimal Code:

🤯

Punycode:

xn--oq9h

URL Escape Code:

%F0%9F%A4%AF

JavaScript & JSON:

\ud83e\udd2f

CSS Code:

content: '\01F92F';