Taking a dump in a friend's toilet and closing the lid without flushing, similar to a sardine in a can.
Aw damn! Jon was over last night and used the upstairs bathroom. He left me a fuckin' shardine!
by JermBoy June 1, 2010
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The word you use when you forget that center Parcs has a rapids

Or

The water slide that your boobs fly out on
Woah look at her going down the Shardin I hope her boobies don’t fall out
by Grxce_lxuise May 18, 2020
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A paranoid tweeker, who's main objective is to get as high on methamphetamine as possible, even if it means picking up shards you or your friend have dropped when last using crystal meth.
Oh look, a shardinal!
by #theshardinal March 7, 2018
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The act of defecation by a Deep Sea Diver no less than 15 minutes prior to Sup checks before entering a Hyperbaric Chamber or conducting diving operations. To prevent contamination and discomfort to others inside an enclosed space with foul human bodily fluids, fumes and major shits (I.e farts/gas/bubbleguts)
Doc forgot to take a shardin and 30 minutes into the dive he had to go while two other divers where in the chamber.

You better take your Shardin!!

Yo, you shardin yet?

Deep sea diver hdnd
by KDSA September 23, 2015
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A single shard of meth that resembles a fish.
My dealer through me a shardine to eat before I took his sister to prom.
by ChubbyTweak94 September 14, 2017
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A single shard of meth that resembles a fish.
My dealer through me a shardine to eat before I took his sister to prom.
by ChubbyTweak94 September 14, 2017
Get the Shardine mug.