going to a friend's house or to a restaurant, not paying or otherwise being grateful to the host, and then immediately leaving with a full stomach, only giving back a quick "thanks".
host: "aww, this food was quite exquisite, dont you think?"
ditcher: "Woah! look at the time! i gotta go, thanks!" *runs out*
host: "AARRRRRRRRRRRRRRRRRRRRRRRRHG! NOOOOOOOOOOOOOOOOOOO!"
host mumbles: "dam dine n ditch"