The act of using a finger to slide a penis into a tight vagina, normally a vagina, imitating the act of using a shoehorn to slide your foot into a shoe.
To "Shoehorn" is the ability and occasional obligation to assist a friend in charming and seducing a girl of their choosing.
A "Shoehorn" is the exact opposite of a "Cock Block". Rather than steal or discourage his/her girl you do your fucking best to get him/her a piece of that ass.
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."
the act of using your thumb as a "shoehorn" to get your "less than excited" cock inside a girl's vagina, when due to a long night, your cock appears to look more like your bellybutton.