Also known as a bong rat. Is an extremely low insult used on people who constantly sit around and smoke billys or bongs. Usually people who have dropped out of school, have no job or extremely lower class no hopers. Generally their whole family smoke and smoke together.
Person 1: Fuck all he ever does is sit around and smoke billys
Person 2: Yer what a dirty billy rat
Person 1: HAHA!
by Hate drugs May 11, 2010

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