You call it a "Janswer" when a person reacts with simple phrases with "I know" or "Thats not even possible" to a joke or a rhetorical question. Janswering is a simple way to piss off your friends and other people around you.
Janswering is often used to skip a conversation. A person which wants to skip your intput and start a new conversation theme would often use a janswer and instantly start a new theme.
Janswer/Janswering:
An example for janswering ist this simple case:
p1: "did u hear of the flying horses?"
p2: "yes" ...starts his own conversation
A beautiful girl, with a good heart but she doesn’t like showing it too much. She stands up to other people especially her friends, She isn’t scared of no one. She looks imitating at first but when you met her, she’s a kind human being.