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1.
Someone's big nose. This is just a Northern word i think.
Look at the size of his Snecker
by Bigbug!! December 13, 2009
 
2.
Yes, sneck is the new hip term.

sneck

intransitive verb

to go stealthily to gleefully take a milestone event from under a friend's nose.
Hedwig is the best snecker at snecking.
by TexDem June 18, 2008
 
3.
A dirty scrubber. One might say, a filth monger.
Look at Gaz! What a Snecker
by The-Shield March 01, 2004