a sexual act which involves a man going down on a woman during her period and keeping some of the blood in the mouth while the woman finishes him off and keeps the load in her mouth. Then, they make out and mix the two fluids in their mouths (red +white = pink). Hence the term bandung which is a pink coloured drink popular in south east asia.
John: Hey man, did i tell you how i convinced my girlfriend to make bandung
Andrew: You sick fucker, get away from me !