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Word play on the phrase 'skally wag', it is used to describe a heroin addict who takes heroin by placing it on his 'glans penis', aka, the end of his wally, the effect being the instant transfer of heroin into the blood stream, yipes.
You see that guy with the long hair, I rekon hes a wally skag!
by Sencerd July 30, 2004
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