When backed into a corner, this phrase functions much in the same way as the phrase, "
fuck you and the horse you rode in on". Taking a more aggressive stance, this phrase entails the classic notion of giving your adversary a dirty
punch in the brown eye, but one for his/her mother as well, offering a powerful alternative to the default "horse you rode in on". Though bringing bestiality into an insult is tandem to a wild-deuce, changing the horse to the
culprit's mother is a straight-flush deal that can be used in any critical circumstance to let your friend know exactly how you feel about him.