A horse which is sexier than a person.
Omg did you see Mariana S yesterday oh god even a horse is sexier than her!
Can also be used as following: "Mariana just got sexy horsed!"
Reacting in a surprising way to something incredibly amazing!
1) Sexy Horse! You're shirt looks so awesome!
2) Oh! SEXY HORSE!
3) Look at the way shes dancing that Harlem Shake! Sexy Horse!!