In the Phonetic Alphabet, Bravo-Charlie stands for B.C., which are the initials for boner check
My friends and I always warn each other when a hot girl is approaching by saying boner check
to each other.
Of course we wanted to warn each other without sounding like douche bags
s, so we started saying B.C.
Bravo-Charlie just sounds better than just saying B.C.
ex.1) "Dude, did you see that Bravo-Charlie that came in the other day?"
ex.2) "You got a Bravo-Charlie approaching your Six