an ibf is an internet friend. someone you haven't met in real life. ibf's skype each other, facetime, text. internet friends can live thousands of miles away. most people meet them but alot dont. when you meet your ibf you run towards each other like no one is watching. your bodies colliding into a hug while you guys are in tears.
person one; "why are those girls running towards each other like that?"
person two;" they're ibfs"