An attempt at oral in which the male or female on the giving end takes the slang "Blowjob" a bit too serious and, well, blows on your dick/vag. Usually done by those new to either oral or sexual intercourse as a whole, and ends up with a tickling feeling of air around one's nuts or clitoris, as well as a tremendous amount of slobber. Named after the leafblowing tool as well as the British's known lack of sexual intercourse, one shouldn't guilt a virgin too much for doing something of this sort on their first attempt.
Dude 1: "Mate, how was Tiffany's lips feel on yer cock?"
Dude 2: "Naaah mate she a British Leafblower. Slobbered all over m'dick."
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