n.

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.

Footnote:
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.

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.

Double Chin

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.

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.

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.

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.

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."