When you "Get Jiffy With It" by spreading peanut butter all over your genitals and let your dog lick it off while you masterbate.

A sexual act where a guy applies marshmallow fluff over a woman's breast and apply peanut butter to her lower body, then folds her in half, has sex with her, and then finishes by licking the mixture off her body and sharing it with the girl.

adj. having copious amounts of peanut butter to the point where milk is absolutely necessary.

Contraction of Peanut Butter and Fantastic, used primarily in modern stoner speech

Peanut butter produced for those on welfare. It is of the poorest quality, and is so thick and dry that you cannot spread it on even the stalest and crustiest bread.

It can be softened somewhat by adding unhealthy amounts of vegetable oil and mixing it together. Still, it will tear a slice of bread to pieces and Ritz crackers will be crushed to powder by it.

Take care not to eat too much at once, or you may see your jaw fused shut permanently.

The act of going from being thin and smooth to being chunky and fat like JIF peanut butter.

What it's called when you're having sex with an old, dried up woman, and you don't have lube so you use JIF peanut butter.

To slather Jif peanut butter all over one's body for sexual purposes. This can be done with a partner, in a group, or even by one's self. One can try this with Skippy or the generic brand, but the taste and consistency of Jif far surpasses these cheap substitutes. It has the unique ability to be able to go into cracks and crevices much better. A nice glass of cold milk should always be on hand when "Slatherfesting"
Slatherfests can get quite out of hand, The Valentine's Day Slatherfest of 2007 resulted in 12 hospitalizations.