A lubricious movie is one that your mother probably wouldn't want you to see, no matter how old you are. Something that's lubricious is inappropriately or offensively sexual.

Something that's lewd or lascivious, like dirty pictures or skimpy clothing, can be described as lubricious. Occasionally lubricious is also used to mean tricky or sly, like a slick or lubricious used car salesman. A related meaning is "oily or slippery," like a lubricious bar of soap sitting in a puddle of water. This is actually the original meaning of the word, from the Latin root lubricus, "to make slippery or smooth."

Definitions of lubricious
  1. adjective
    characterized by lust
    “eluding the lubricious embraces of her employer”
    synonyms: lustful, prurient, salacious
    marked by or tending to arouse sexual desire or interest
  2. adjective
    having a smooth or slippery quality
    “the skin of cephalopods is thin and lubricious
    slippery, slippy
    causing or tending to cause things to slip or slide
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