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

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An old faithful is upper-decking taken to the next level. Here are the steps:

1) Remove lid from toilet
2) Flush toilet, then grab black floating ball in the tank before the bowl refills. Hold the ball there for now. The bowl of the toilet should be empty.
3) Fill the bowl up with vinegar
4) Pour about 5 boxes or baking soda into the tank
5) Release black ball, so the baking soda mixes with fresh water, and replace the lid. - leave, watch, and wait.

When the next user of the toilet takes a shit, the vinegar and baking soda mix to make what can only be described as a shit volcano.
I took a shit in my friend's toilet. When I flushed, it overflowed into a foamy brown mess all over the bathroom floor. It was then that I knew my friend was a victim of Old Faithful.
by moustacherocker July 25, 2006

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Double Chin
Kelly, your old faithful is showing.
by yo mamma>dayum straight February 02, 2009

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While a girl is fingering herself, she lifts her lower body in the air. Then, as she squirts, it looks like a geyser spraying up into the air. As the squirt juice falls back down, the girl then flails around with great passion as she is covered with her own squirt juice.
Guy: Why are you so sticky?
Girl: I just got done doing an Old Faithful.
Guy: What the fuck?
Girl: Yeah, I do it EVERY time I masturbate.
by Haywood Jablowmii September 06, 2012

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The act of utilizing chewable breath mints and diet soft drink to produce a violent eruption of carbonated water from a vagina. Useful in retrieving items jammed up against cervix during the practice of cannon fodder.
I jammed Mentos and Diet Sprite up her cunt to get her to do an Old Faithful.
by Profane Urbane November 06, 2010

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this is when the male ejaculates in or onto the anus of a female, she then farts and the jizz shoots up into the air, resembling the geyser, old faithful.
Jose: I got bored last night so i gave Jen the Old Faithful

Mike: Nice, ill test it out on Brittany
by Jack10392 May 06, 2010

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The act off nutting (ejaculating) inside someone's mouth while they are on their back then stomping on their stomach. Those wearing a Used Poncho can avoid the geyser's angry eruption.
My girlfriend took one in the mouth from me last night so I stomped on her stomach, thus completing the Old Faithful. Wish I would've had a used poncho on...
by Brettford January 07, 2013

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When a male (i.e. someone with a penis) masturbates to the point of ejaculation, at which point he inseminates his own visage; a self-facial; jizzing in one's own face.

Also, a CoRec Ultimate team at UC Berkeley.
"Might I borrow your handkerchief? I just Old Faithfulled and my glasses could use a wipe."

or

Stranded on a desert island, Gerry had to resort to an Old Faithful to fill his facial quota.
by uncoveredmoose January 28, 2010

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