Definitions:

Deck (noun) - The clean water tank of a toilet. Often referred to as a toilet backrest

Upper-deck (verb) - The malicious act of making doodie in the water tank of a toilet,
thus contaminating the toilet's clean water supply.

Syn: Upper-Tanking, Backstopping, 'The gift that keeps on giving', '2000 Brown Flushes',
'The bottomless glass of chocolate milk', Top-Loading, High-Bowl

Upper-deckerer (noun) - One who performs the act of upper-decking.

http://www.antiupperdeck.com/

Afghanistan supplies around 90% of Europe's heroin
The UK had the largest rate of heroin seizures and the third highest number of heroin addicts in Europe in 2004, the UN has warned.
It said increased production in Afghanistan, where most of the UK's supply came from, had not helped.

UN drugs watchdog the International Narcotics Control Board found the UK had Europe's highest amphetamine usage and the third highest for ecstasy.

Cocaine abuse in the UK had also risen despite stabilising in Europe, it said.
http://news.bbc.co.uk/1/hi/uk/4309729.stm