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1.
An overrated South African rugby team hailing from Pretoria and compete in the Currie Cup who are generally renowned to be (among other things) brainless, overweight, beer-swilling, louts. Also used to refer to their fans who reflect the rugby team exceptionally well in the above attributes.
"Why is he drooling like that?"
"He's a Blue Bulls supporter"
by Museite October 17, 2008
 
2.
Schlitz Malt Liquor
Hey, while you are in the fridge get me a blue bull.
by meehafr November 19, 2010