1. (noun) a young woman, usually under thirty, with the implication that her vagina is excessively small(tight) so that one may "need a shoehorn" to insert anything into it, i.e. a penis, finger, dildo, squash or coke bottle
"Nice...look at that shoehorn sitting over there."
"Laura was a shoehorn; I had to work it for 45 minutes until I could hit it."