The act of sitting on an open bottle of tequila and doing a hand stand. Gravity will empty the bottle into your anus, causing an alcohol-induced blindness that will send you into a furious fiesta. Ole!
Tom: Hey PJ, two words: Tijuana Takedown.
Tom: let's get ass-drunk
PJ: cool, I'm down do be a drunk ass tonight
Tom: nah man, it's where you get drunk via your ass. Like a tequila handstand.
PJ: sounds dangerous.
Tom: fuck ya it is. Let's sit on some bottles!
PJ: no fiesta.