Done, generally, to someone in your social group over and over again until they find out it's you.
You stop when they start to get annoyed and then do it once a month or so, so the joke does not die.
Person 2: We'll have to put it in Battle Mode
*Person 1 and 2 put XXXs car's windscreen wipers up*
2.)(n) To be in Battle mode can also refer to putting on one's socks
(going into battle mode!)
2.) Hey, you in Battle Mode yet, we have to go in five minutes!