@rakokuc ja słyszałem inne tłumaczenie

A tak w ogóle skąd się wzięło:

Deep Throat is the pseudonym of the key informant in the Watergate scandal who provided information to journalists Bob Woodward and Carl Bernstein, eventually leading to the resignation of President Nixon in 1974.

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Deep Throat, the 1972 film, follows the story of a woman who discovers her clitoris is in her throat, and as a result develops a particular oral sex technique referred to as “deep throat.”

Thanks to relatively high production values, Deep Throat became a bit of a phenomenon. In a 1973 review of the film by Roger Ebert, he calls Deep Throat “pornographic chic” and mentioned that Mike Nichols, the director of The Graduate, told Truman Capote that “he shouldn’t miss it.”