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
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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, 2004
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