Horse-masking is an erotic practice in which you pee into a horse mask and place it on your head(usually practiced while taking edibles).
Guy: "Yo what you doin tonight"
Horse-masker: "Imma just be chillin with the bros doin a little horse-masking"
Horse-masker: "Imma just be chillin with the bros doin a little horse-masking"
by Philip.McCrevis April 23, 2019