Originally Posted by Matthew Good... Band
This means that "boo-urns", as an out of context phrase, should be used as a positive.
Except it's a reference to a very specific joke. The idea that anyone would shout "BOO-urns" is ridiculous. Whether or not it's positive or negative is irrelevant. The jeer's been turned into an allusion meant to call attention to their taste in pop culture, not to actually express pleasure or displeasure.