The Sadge emote is used when you want to show yourself sad, disappointed or depressed.
It shows the famous cartoon character "Pepe The Frog" with a sad and disappointed expression on his face.
Rumor has it that the word "sadge" is a combination of the words "sad" and "cringe". For example, it is used when a streamer fails to complete a level, loses a game, cancels a stream, or tells a sad story. Like any emote, however, Sadge can also be used ironically, expressing the exact opposite.
Sadge has only been available since 2020, making it one of the younger emotes. Like so many emotes, the Sadge emote is based on the character "Pepe The Frog" by Matt Furie and originated as a variation of the early memes on 4chan. Sadge became popular through its use in chats by Forsen and AdmiralBulldog.
However, the Sadge emote is not usable everywhere and you have to resort to browser extensions.