Also, the sentence he was trying to say was "The guy whose trailer they were whacking off in," and instead tries "The guy in whose trailer they were whacking off." Apparently this sentence is impossible without either changing the euphemism or breaking this rule.
to
Also, the sentence he was trying to say was "The guy whose trailer they were whacking off in," and instead tries "The guy in whose trailer they were whacking off."
...because I am given to understand that the phrase is "whacking off", and the word "in" was only descriptive of their relation to the trailer.
JET73L: Changed
to
...because I am given to understand that the phrase is "whacking off", and the word "in" was only descriptive of their relation to the trailer.