From your Slack desktop, click on the workspace name in the top left. Then click Customize Slack.
This will open a new tab in your web browser. So if you started on your Desktop application, you may need to sign in to Slack in your browser.
From the Emoji menu, click Add Alias, then Choose Emoji. This will allow you to add an alias for an existing emoji.
Click Choose Emoji and select the emoji you want to alias in the dropdown menu. For my case, I'm going to choose the 🎉emoji.
Under Enter an alias, type the short code you'd like to use. In my case, I'm entering
Click Save and you're ready to party! Now when you type
:party: in Slack, it will show the