Top Definition
Known from coast to coast as the finest cannabis in the US. Grown, usually by either hippies or CU students in Boulder, Colorado. Apparently, the altitude has something to do with it. Comparable to BC bud.
Denver guy: 'Hit this.'

BC guy: *hits the pipe*

BC guy: 'that is some fine bud you have there, my american friend. wherever did you acquire such potent ganja?'

Denver guy: 'it's boulder weed. a guy on my friend's floor at CU grows it.'
by frank carter September 02, 2007
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