Is it true that girl friends make out with each other?

[Pant Leg Eater from the Bad World]

Well damn. No one told me this was a girls-only thing.

Guess I'll just have to stop making out with my bros now.

I have seen that as well, to be perfectly honest - a girl giving her own brother a kiss on the mouth.

Please tell me you know what I mean by "bro" in this context.

Hey bro, let's go to the bathroom together and make out...