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1.
Any preposition that can be viewed as a sexual act; i.e. any preposition in the human language.
JOB INTERVIEW

Boss: "Please refrain from making sexual propositions toward fellow coworkers.'"

Prospective Employee: "What about sexual prepositions?"

Boss: "What??"

Prospective Employee: "Over... Under.... Around... Behind.... And between."
by Afro Burkal8tion March 04, 2010