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To pull out just before the point of ejaculation. From the last rail station before arriving in Portsmouth (UK)
See also billy mill roundabout, chilworth roundabout
I was on the vinegar strokes but at the last minute i got off at Fratton
by Doc Sausage December 29, 2003
British Royal Navy term for the withdrawal method of contraception, Fratton being the last railway station before arriving in Portsmouth, which is the end of the line.
Matelot 1: "Firkin 'ell mate, that's a right swamp donkey you've pulled, do you need a condom"

Matelot 2: "no mate, I'm getting off at Fratton"
by Lajopi 292 August 18, 2008