The command used by a third party member of a two person conversation which is directed towards one of the conversationalists in the case that the conversation has reached a point where there is nothing to say. This lets said conversationalist know that it is time to say, "jimfeed" and walk away.
Albert: What's up?
Shiva: Nothing much.
Albert: Wanna hear a funny joke?
Cornelius: (whispers) feed the jim