Reverse Upfriend

(v) When a friend or relative's friend befriends you after meeting you. This is not as common as upfriending but does occur occasionally when the friend's friend realize you are a upgrade. This is the ultimate insult to the original friend or relative.

Eric and Christine reverse upfriend. Eileen and Johnny by inviting them to the neighborhood barbeque

Upfriend

(v) - to gain a better quality friend from a mutual friend.

My friend Jason asked if his friend Glenn could come to dinner with us. After meeting Glenn, I had to upfriend him.

Upfriending

When you acquire jet wealth you ditch your old less wealthy friends for the rich folks.

Steve sold his business for millions and then ditched his less wealthy friends for the rich and famous, basically upfriending