A fork of Rural Dictionary
An anime nosebleed is when an anime character or someone in real life gets a nosebleed due to seeing something sexual. Whilst this doesn't happen as much in real life, it is possible, because seeing something can lead to a raise in blood pressure, which can cause a nosebleed.
Joey: Yo have you seen the trailer for season 5 of dat anime???
Matt: Yeah someone got an anime nosebleed in it lol.