Unfriendly fire is when you fart on a friend as a joke. Unknown to you, this certain friend also happens to have a nasty fart brewing, so they release it upon you as immediate revenge
"Last night when I was hanging out with my friends, I decided to rip a fart in Franks face. Unknown to me, I was about to be hit with some unfriendly fire."
An African American person who is very attractive but is very mean to people outside their immediatefriend group. An example of this is in the movie mean girls.
