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1) The act of showing appreciation for an attractive female walking around showing skin by one quick "toot" of a car horn.

2) In colder climates, the lack of clothes can be overlooked and the same appreciation still given for attractiveness.

3) In particularily fine examples, a quick double "toot" is acceptable and should be considered an advanced maneuver.
"That girl was fine, so I gave her a skin toot"
by Batman81 April 03, 2012