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1.
When one takes drugs expecting to get high but the drugs are of sutch a low quality that there is barely any discernable buzz one is on a quack candle. Unsure of the origin but we all use it all the time round my way.
Randall paid thirty quid for some speed but as it was shit he ended up on a quack candle
by DanTheMan123 June 23, 2004
 
2.
A made up drug its rubbish
I got completely off my spunky backpack on quackcandle and now i feel like a fortnight in a bad balloon
by Lovejoy's Lovechild September 08, 2006