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I tried urbandictionary.com for "tacky" and found the following:

4. Tacky
A popular playground manouver in Liverpool. Tackying is the act of rubbing one's hand on arse-crack, grundle and ball-bag before rubbing it in somebody's face. the Tacky is a punishment reserved for only the worst of playground Knob-shines

I'm not sure if the Urban Dictionary site is accurate, but it is a similar context.