When somebody has the head of a horse, but the body of a human.
Man I saw her with a snapchat filter and she looked decent, in person she's actually just a horserefovic.
"Triggered af" is an adjevtive that is a specific category describing someone gets offended or gets their feelings hurt after specifically being pranked by 'the boysh' (the boys).
Boy 1: "Damn boys, we got Jeanette good there"
Boy 2: "Yeah I know right! She is triggered af"