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Based on the children's nursery rhyme this sexual act entails taking a girl from behind doggystyle and inserting one's thumb in her anus upon climax.
As in....Little Jack Hornher... he stuck in his thumb, made the girl cum, and said, "What a good boy am I".
by Jack Inghoff January 18, 2009

Words related to Little Jack Hornher

her horn hornher jack little