A burn is defined as a clever retort that often will ridicule/insult another...

while chatting with Haruna today, I heard one of the COLDEST burns that I've heard in a LOOONG TIME!!!

Me: So Haruna, I have a friend that works with Elon and he may be able to get us in on the SPACEX IPO.

Haruna: John ... 不要再說謊話好不好。。。[Stop lying] ...

Me: what?

Haruna: YOU KNOW DAMN WELL YOU HAVE NO FRIENDS!!