A man pointing to his ear. ๐งโโ๏ธ represents a deaf or hard-of-hearing man.
Deaf men use it as a self-portrait, and others use it in posts about accessibility or sign language. As a joke it can mean "I didn't hear that" or "not listening."
Facts
Deaf man ๐งโโ๏ธ is an emoji in the people and body category, under person gesture. It became part of the emoji standard in Emoji 12.0, released in 2019. It is a sequence that joins ๐ง deaf person and โ๏ธ male sign. Devices that do not know the sequence show those emoji side by side. It comes in five skin tones, from light to dark. On GitHub, Slack and other apps you can type it as :deaf_man:. People also look for it with words like โaccessibilityโ, โdeafโ, โearโ, or โgestureโ.