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1.
an alcoholic beverage after a game of golf
After a tough golf game he went for a 19th hole.
by The Return of Light Joker May 24, 2009
 
2.
Hooking up after an event, ala in golf where the 19th hole is where you go to drink.
Event Planner 1: Everything's finished. Have you seen Debbie?

Event Planner 2: She found a cute guest and took him to play the 19th hole.
by EBman December 07, 2009
 
3.
When a man uses his dick to tap his balls into a girl's ass. Like making a putt on a golf course.
My girlfriend and I were fooling around and instead of anal sex, I 19th holed her.
by Dan L A June 13, 2007