A Dunster is some one who is dense in the worst way. A term derived from duns cap, and shyster. A term created in Canada for describing complete idiots.
Noun - The name given to a close friend (aka homie) that is comatose at a party. When your dunny drinks too many roofy Coolattas at a party and can no longer communicate, he becomes a dunster.
Did you see the way that that fat girl made that blacked-out dude lick her beef curtains. What a fucking dunster he is.
Another word for a Gay man's mustache. This means the gay man likes to toss his partners salad thus calling his mustache a biscuit duster. (Biscuit=Butt)
Jordan and Timmy are going to have extrafun tonight since Jordan grew out his "Biscuit Duster".