A euphemisn for anal sex. Originally defined as any homosexual activity, the term grew to mean any type of anal sex in general. (Hetrosexual or otherwise).
Designed to allow those who engage in the act to talk about their sexual exploits in relative secrecy around people unaware of the definition. Although has become less effective as it has spread to be fairly commonly known in its city of origin. Melbourne, Australia.
Berocca itself is a tablet soluble in water that contains vitamins and is used to aid general health and well being. It is popular as a hangover preventative or cure.
Christian: Dude way to much berocca in my coffee this morning.
David: You shouldn't mix berocca and coffee that would taste terrible!
Christian: No dude, I mean I had my ass pounded like a freight train and can't walk straight, duh.
David: Oh I get it, the coffee is your butt, and berocca is a black man's penis. You gay guys crack me up with your crazy words.
Mary: (on a crowded train) Wow I got some serious berocca in my coffee last night.
Julia: Oh yeah, who's the lucky barista?
Stranger: Do you girls mind!? I don't need or want to hear about how much berocca you got last night. Jeez.