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Jelly Side Down 

Masturbation technique for men.

Begin by gently tucking the penis and testicles between the thighs and squeezing the thighs together to hold it in place, creating a mangina (manjina) in the front and a fruit basket behind (see also the Buffalo Bill Tuck). Then, while laying face-down (hence "Jelly Side Down"), use two to three fingers to push the penis backwards and then let it release forward. Repeat motion as desired. When achieving climax, squeeze thighs together to create a cum-tight seal while pointing the penis behind you so that ejaculate will not travel between your legs onto the sheets/rug/desk/sofa/park bench.

See also: Transgender Soldier, Lotion Basket, Jelly Side Up, Fingerwank, and Steve Irwank.
Wife: I'm on my period, baby. We can't fuck tonight. Why don't you just take care of it yourself while I watch TV?
Husband: I just feel awkward about doing it in front of you because I only jack off jelly side down.

Twice up the barrel, once down the side 

A self-contained phrase that states something is indisputably right during any kind of disagreement.
After debating for hours, Julie said to Mike, "No matter what you say, I will always know tennis balls are yellow, not green. Twice up the barrel, once down the side."

keep the rubber side down 

cycling slang for 'be safe'
on your next ride be sure to keep the rubber side down!

Jammy Side Down 

A way of determining if the dark lord satan is near by throwing a covering one side of a slice of toast with jam or jelly and throwing it into the air. If the toast lands Jammy side down, the dark lord is near.
*throws toast*
guy 1: Jammy side down...
guy 2: Shit

shinny side down 

the method of using foil to smoke heroin off of .
when using foil you slide the heroin on the dull side of the foil , easily remembered by "shinny side down"!
person 1: "wait ...uh which side do i stick it to?"
person 2: "cmon... shinny side down!"

let the side down 

To perform not as well as expected, to let down.
The team practised a lot before the game, 'cause they didn't want to let the side down.
let the side down by Golan May 6, 2005