Open your Google Slides presentation and click on the slide where you want to insert an emoji.

Click on "Insert" in the top menu and select "Special characters".

In the pop-up window, click on the dropdown menu and select "Emoji" from the list.

Browse or search for the emoji you want and click on it to insert it into your slide.

If using Windows, press Win + . (Period) to open the emoji picker and select an emoji.

If using Mac, press Cmd + Ctrl + Space to open the emoji keyboard and insert an emoji.