boyfriend: i hate you too bitch
girlfriends best friend: let's be frienemys
You run out of sports drink , your frienemy will not give you a tiny bit of theirs until they have finished thier competition, even though they have more than they need.
friends you know don't really like you and you don't like them either
friends you get that were once enemies because you're planning on stabbing them in the back
"Don't invite Sarah...she's only a frienemy."
Frienemy: "Wassup retard, looking fugly today!"
Friend: "Thanks man!"