When a man and a woman are having passionate intercourse and partake in the act of synchronized urination into the opposites' genital area. Said action then creates a portal leading to an alternate universe.
Bieber fan #1: I haven't heard from Justin and Selena lately.
Bieber fan #2: Haven't you heard? They created a portal potty backstage at his last concert, and ended up in a tribal Zimbabwean village!
Bieber fan #1: Sigh, I wish that was me.