A term usually used by older folk to explain what kids are doing when they are actually smoking marijuana
While crouched over the bus Isle in the back, passing a blunt, you and your friends hear the driver yell, "What are you kids doing back there!? Flipping Coins!?
A "heads I win" (i.e., if da coin "lands heads", then you hafta "give me head", as in, perform fellatio on me) and "tails you lose" (i.e., if da coin "lands tails", you hafta "give me tail", as in, "your a** is mine" --- i.e., you hafta do it doggie-style wif me) type of deal, whereby da chick hasta intimately interact wif you in any case, no matter what da outcome of da coin-flip.
Da sexual coin-flip is almost as unfairly-advantageous to you as da "if I win, you hafta have sex wif me, and if you win, I hafta have sex wif you" deal, whereby you get da chick to spread her legs for you regardless of who scores higher in da game.
When a brave drug addict drops Acid, and proceeds to smoke a joint. When the acid kicks in, they make shroom tea and wash down MDMA and 2CB with the tea. Once peaking - in succession the drug addict ingests a K-Hole line of ketamine, inhales a breakthrough dose of DMT, exhales the DMT vapour into a NOS balloon, and inhales/exhales the NOS Balloon containing the residue DMT vapour until they disappear.
Holy balls dude Ricky just did The Coin Flip and he disappeared!