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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
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

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"

Pineapple shelving

A person who makes themselves the centre of attention. Ruins a party by showing off doing pineapple tricks. Basically nobody likes them yet they have dedicated fans who devote their lives to them. Cant sing at all. Likes Girls on Horses.
'Hey Did you hear Steve from all the B&S's is totally pineapple shelving now?'
'What as in shelving them? Pineapples?'
'Yeah it all started when he started putting lipgloss on and liking girls on horses'
'Wow, I never really liked him anyways tho hey, and that girl whos always with him, what is she 100 years old?'
'Yeah and the chick who has devoted her whole car to him'

Selvening 

To be certain of yourself in an uncertain way. In other words A form of insanity that is only gained momentarily
Don't worry about him he's just selvening right now!

I couldn't even imagine selvening!
Selvening by Gremlinz0_0 April 8, 2023

gut shelving 

Placing your fat beer belly on the back of a women during doggy style sex to relieve pressure on the knees.
Guy1: My knees have been killing me lately during doggy style coitus.
Guy2: You should really try gut shelving to relieve the pressure on your knees, mate.
gut shelving by ThatJO February 2, 2018