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Inserting a foreign item into the rectum.
Usually in regards to recreational drugs.
A discreet and effective way of taking them.
"I haven't got much left, so I guess I'll shelve the rest"

"When it comes to taking drugs it's all about shelving"

"He passed out early so we shelved him a gurner to get him keen again."

"Urrrrgh, I definitly shelved too much MXE last night"
Shelving by DagdA LamB February 20, 2014
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alternate way of taking drugs by inserting them into the anus
hey ben, i'm going to swallow one pill and shelf the other one
shelving by Jamie November 29, 2003
1. When a fat man is fucking a skinny woman from the back but has to "shelf"(rest) his stomach on her ass or lower back

2. When a pregnant woman has to rest her stomach on a table
Example 1. Tom: Dang, Sheryl must have serious back problems!
Denise: Why's that Tom?
Tom: Because Sheryl gets shelfed by her fat ass husband
more than a used book at a bookstore.

Example 2. Husband: Hey honey, do you need to stop and rest for a bit?
Pregnant wife: Yeah let me shelf on this picnic table really quick.

(variations include: shelf , shelved, shelving)
shelving by IllWizzle May 23, 2009
An Australian colloquial term coined in Wagga Wagga, N.S.W defining a hand action produced when listening to heavy metal music, particularly during an epic guitar solo.

The shelving action references the putting of drugs in ones anus. It is performed by holding the palm of your hand upright, with fingers elongated and violently thrusting your arms back and forth.

Contrary to popular thought the shelf is actually a sign of adoration for a band, and its use has subsequently spread across Australia, and across genres.
Chris was so into the metal music he couldn't help himself. He raised his arms in the air and thrusted it back and forward violently. There was no metal horns to be seen though, all his fingers were stretched straight out.

"Shelve it!" He yelled...

"Whats that?" replied a fellow metal head.

"It shelving!" Chris said enthusiastically.

Soon everyone was shelving along to the bands.

The guitarist spurred on by the crowds response ripped out an amazing shred solo...
Shelving by Leicohtica May 18, 2010
When you shit an entire log onto the toilet seat, on purpose.
Bro! I totally just shelved a log on that bitches seat.

Ewww my boyfriend is into shelving!

Dude, I think I’m gonna shelf at that girls party
Shelving by DJ Pies February 22, 2020

Shelving Rapids 

The act of inserting and holding Panadol Rapids (a tablet formulation which contains sodium bicarbonate and is intended to increase the rate of gastric emptying) inside of the anus
"Kez why are you late to training again?" "Sorry coach, I was just shelving rapids"

Shelving Unit 

An extraordinarily large pair of breasts. So much so, that they have ascended beyond the point of simply being a "rack", and have in fact raised to the level of a "shelving unit."

Often used as a way of expressing the sheer monstrous volume of fat contained within the Mammory Glands of a Homosapien (Human) Female.
Guy #1: Man, check out the shelving unit on that!
Guy #2: I bet you could even rest your elbows on them to light your smoke.
Guy #1: My dream girl.
Shelving Unit by Edward Fitzgerald December 22, 2010