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Trailing is the sexual act of when you rub your pink finger against another man's anus, until they release poo onto the finger nail. They then leave it to dry, before scraping it off with their teeth.
Harry: I was out with the lads yesterday, when Colby suggested I tried to grail with Dan! To be honest, his poo tastes so nice!

Barney: Gotta love a bit of Grailing on the weekend! HU!
by Barnabus69 December 06, 2016
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