Mad, or stupid.
Welsh slang. The phrase originally comes from the action of having tapped a barrel of beer, draining its contents. The comparison made, then, is between a half-empty barrel of beer and a half-empty brain.
"Watch out for him, he's tapped."
"Are you tapped or what?"
Popular slang that emerged in West London schools as a way of expression of profound personal appreciation of any object, person or action in 2006 / 7.
Tyrelle: Aw man, dat girl was greazy, blud.
Roshane: Greazy? Nah man, nah you should see mi PS3 blud, *dats* greazy.
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