a name-calling device that can also be used as a comeback; a device that can also be an excellent conversation stopper
a person who has pissed you off (by saying something or doing something ridiculous or embarrassing, etc.) bad enough to make you swear at them, but at the same time you don't know what to say to them or it is a bad place or time to swear at them
-person1: "this is me caring... 'zzzzzzzzzzz' "
-person2: "you're a fartcake."