When you yourself are stuck between two people that want you (be it sexually, emotionally, for a
relationship, or simply due to
territorial instinct), and
consequently hate each other.
Works for either two women jealous of the other for being around one guy, or vice versa.
Dude: "Oh, man... is that Karen??"
Bro: "Woops... yea... she totally just saw me with Steph!"
Steph: "Who's Karen???"
Dude: "Wow... well, I hope you enjoy your
peanut butter and
jealousy sandwich."