Several third-party Discord bots (e.g., "AwooBot" or "WolfBot") include a feature where typing >awoo or ?awoo makes the bot respond with a text-based wolf howl, a GIF of an animal howling, or a sound clip of a howl. This is used as an or mood-setting feature.
If someone says, "Did you hear the awoo?" in a Discord context, they are referring to: