A term used by hunters for any type of dildo, vibrator or phallic pleasure device. The term originates from the "Pheasant GutWrench" a tool used by repeated inserting and then pulled out of a pheasant will remove it's internal organs.
Added to the fact that the "Pheasant GutWrench" looks like a dildo.
Not to be confused with a peasant wench; a cheap prostitute
Hunter 1: Are you worried about you wife getting lonly while we're away Hunting?
Hunter 2: Nope, I made sure she got a few new Pheasant Wrenches for herself. Gotta make sure she's kept content till I get back.