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Verb - See fuzzle.

As a gesture of affection, this counterpart to fuzzle is done on a bald person. One tappates another by very lightly and briefly drumming or tapping the fingertips on another's head, usually just above the hairline. Not to be confused with noogie, which has more violent connotations.
"C'mere you little cutie; let me tappate your head!"
by N.Berry April 14, 2007