Tube steak

Penis.

Full Metal Jacket quote: "I wanna stick my tube steak into your sister. What'll you take in trade?"

This refers to a sexual barter done both in military and prison environments, whereby one individual lubricates an armpit ("his sister"), and allows another individual to use it for simulated copulation. The armpit serves as a vaginal substitute for the penis ("tube steak"). Pressure could be varied by arm compression and flexion, for a more pleasurable simulation. "Trade" ranged from money, to supplies, to cigarettes, to chores and duties.

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