BIG FOR NOTHING -pronounced as beefin-girl or guy who thinks they are all that but are big with no muscles- commonly used in the slang of teens and young adults in new zealand.
hey he's hot
(laughs) he's got a mud body, why are you into bfn boys for ae
-Sophia: "Just for that, I'm gonna get kbbq tomorrow without you"
-Adam: "You bfn"
-Sophia: "Bfn?"
-Adam: "Better fucking not"
-Sophia: "That is rude !!! And I will!