Used in a form of rape. A hook installed in the inner wall of the vagina that hooks the penis when it is inserted making it so that the penis can not be pulled out in time. Causing the male to ejaculate and cause pregnancy. Typically used by larger women who realize that they may only be able to have sex once and then have a hook trap installed to make it so that at some level the man is stuck with her.
Guy 1: Have you heard of a hook trap?
Guy 2: Yeah I heard that Emily has got one, I've gotta stay away from that!