Feeling of want or need for something or someone that a friend might have.

People often experience frienvy when a close friend of theirs loses weight, gets a promotion, or finds a new boyfriend/girlfriend.

A casual invitation / threat used by an individual that is not afraid of fucking someone up.

Intense, inexplicable jealousy of people you aren't friends with who share, or are potentially trying to steal, your friends. Especially prevalent in boys with groups of female friends that other, rival boys then befriend. Frienvy is accompanied by possessiveness, bitterness, douchebaggery, and insistence that the OTHER guys are "sleazy" and just want to "get in" with the girls so they can "bang the living shit" out of them. Also, guys suffering from frienvy will deny the fact at all costs.

When your friend becomes jealous that you've made other friends.