A popular playground manouevre 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 punisnment reserved for only the worst of playground Knob-shines
A typical situation in which a Tacky would be administered:
"did you hear what Smigger was saying about your ma?"
"Yeh, I Tackied fuckin beaut."