Old Faithful 

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.

Old Faithful by Cap'n Sea-Biscuit Crunch April 29, 2009

Old Faithful 

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.

Old Faithful by uncoveredmoose January 28, 2010

Old Faithful 

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.

Old Faithful by Profane Urbane November 7, 2010

Old Faithful 

When you’re asspumping a dirty tramp face down on your mattress and feel like it’s that time time of day. Your dick hurts and it’s time to take a piss. With your Johnson stuck deep in her rectal cavity, you strike a firm blow to the back of her head in order to make her ass tighten up so there’s no way out of it for this bitch, then proceed to leak in said area until you feel the tank is properly full. As she screams in disbelief, swiftly remove your genitalia from the region. This should produce a large eruption of your unloaded piss which exits the asshole with astounding velocity, mimicking the famous geyser located in Yellowstone, Wyoming.

Her: What the fuck, did you just piss in my ass?!

You: (Whips out phone) Holy shit it’s old faithful!!

Old Faithful by JJbangs124 June 27, 2020

Old Faithful 

After taking the girl's nose ring out, finish in her mouth after receiving oral, then tickle the young lady creating a geyser-like eruption out of the side of her nose, similar to Old Faithful.

Redface observed the magical beauty of the impressive spray that came out of Kelly's nose when he gave her an Old Faithful.

Old Faithful by Red Face December 2, 2007

Old Faithful 

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.

Old Faithful by bobbyz18 June 17, 2011

Old Faithful 

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."

Old Faithful by AsevenX88 August 16, 2011