Definitionassume the position, to lean a suspect forward against a wall (or car), legs wide open, while patting (frisking) him/her down for weapons. By extension, to assume that position for anal or vagina penetration from the rear.
(1) John Buckner (Kieffer Sutherland) to Huey Walker (Dennis Hopper) in Flashback (1989):
-- John: 'Assume the position.'
-- Huey: 'Which one did you have in mind? '
(2) Mac (Gene Hackman) to Reva (Nancy Travis) in Loose Cannons (1990):
-- Mac: ' Assume the position.'
-- Reva: 'This is the position you meant, right? I watch American TV. At least you didn't say spread 'em.'
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sprain an ankle
sprained her ankle
spray (the bowl)
spray the porcelain
spraying the spectators
spread one's ass
spread one's cheeks
spread some good leather
spread some sunshine
spread your legs
spread your net wide
spreading a technicolor rainbow
spreading the folds
spreading the mayo
spreading the petals