A man's smell, attitude, the 'vibe' he gives off, and how people treat him. Different from plain ole "essence" that has a general use.
"Evin" adds a reference to the similar-sounding band and is the name of a man in Hawaii who wears strong cologne and has thereby become associated with the term.
Avery - "What the hell's that smell? It's like someone assed up the Axe in here."
Noah - "Nah, it's Evin, man. Evin and his goddamn essence."
Avery - "I should've known. Evin-fucking-essence."
James - "Don't look now; we got evinessence inbound."
Rayshi - "Where?!"
James - "Don't look so excited. Not that evinessence."
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.