when your stuck in the middle of a busy room when there is no ash tray to be found ! .... and you just simply cant be arsed getting up to get one !
Background: A hobbit like man named Grant was sat balanced precuriously on two desk chairs when he glanced at the people in the room and uttered the words "shit man I'm islanding!"
Whilst a person is engaged in conversation with another person, one of the involved turns his/hers head during conversation, and pukes. Preferebly in the opposite direction of yours, but definitely not a must.
In rare cases, the person that vomits tries to finish the conversation after said vomiting. That is the sign that you are beholding a Grand Islandic Dragon.
- "Nah, but I saw this dude pull off the islandic dragon in front of another dude. A bloody miracle he didn't get any on the dude's shoes, dude was spraying like a motherfucker."