A ex-girlfriend or girl you can always depend on for sex when your feeling lonely.
Jimmy: Hey man I just got turned down by that hot girl at the club.
Bobby: No problem man, just call up your old faithful.
Jimmy: I didnt want to resort to that but sure, I really need some sex.
by daGangst4man September 07, 2008
A sexual act. It is when you pour an entire bottle of lube into a girls ass. Then, upon the first thrust, the lube sprays out like a geyser.
"Whats all that lube for"

"Yellowstone, here we come, Old faithful, baby."
by AsevenX88 August 13, 2011
The act of ejaculating semen on another's rectum then demanding that the person upon which ejaculation occurred must pass gas immediately. Ejaculator then looks at clock and says, "right on time."
Little Tim gave Sally the good ole' Old Faithful last night.
by bobbyz18 June 17, 2011
When you place a heaping amount of cocaine on a girl's butthole and do a bump. Must be done quickly before geyser explodes sending flakes everywhere.
Why don't you drop those drawers and let me get an Old Faithful off your sweet meat?
by Rustavo Moussego May 16, 2010

1. The act of flatulating under the covers while in bed and spitting in the air so your significant other has to cover his or her face. Thus forcing them to bask in the ambiance. A variation of the dutch oven, just more sinister.

The victim of the Old Faithful is forced to choose between the lesser of the two evils: saliva or methane. It's win/win and %100 percent effective. Hence Old Faithful.
Last night my wife was complaining about me never talking to her after we have sex. So, I took a deep breath, let one slide, and gave her an Old Faithful. Needless to say we're separated now, but she had it coming.
by jason "jewboy" tracy July 31, 2006
A Lesbian sex act where two partners interlock their spread legs (like two pairs of scissors) and grind their vulvae together to stimulate each other's clitoris to orgasm in which a males penis is in the middle of these two vaginas and at the peak of his orgasim he blows his load into the sky like the Oldfaithfufl
3some in which to girls rub their vaginas on your cock at the same time while their legs are inner twined and when you come in the air it is called the "old Faithful"
by Broskiii Keller November 03, 2010
After a male cums inside his partner's belly button while they're laying down he mounts them reverse cowgirl and slides back so his anus is over the belly button. Next, he farts and the result looks like the Old Faithful geyser.
Guy 1: So I gave my lady an Old Faithful last night..

Guy 2: And?

Guy 1: Let's just say we need to repaint all four walls.
by Cap'n Sea-Biscuit Crunch April 29, 2009
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