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British euphemism for sex OR

Something that happens in really cheesy women's prison movies, where a woman (usually only half protestingly) is forced to have sex with her fellow inmates.
Let's go to a hotel, luv, make a tent from the bedcovers, and have a blanket drill

I love the part in the movie where the woman guard gets gang banged by half a dozen female inmates having a blanket drill
by Betty Rocks September 23, 2006
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