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"Por que no los dos?" is a Spanish phrase meaning "why not both?". It was bastardised when first introduced to the English language from an Old El Paso advertisement, where a family of mexicans are feuding over the difficult decision of either having soft or hard shell tacos for their burritos.

The phrase has since become a frequent part of the Australian vernacular, particularly to bogans with limited knowledge in Spanish (such as myself), where "por que no los dos?" can be exclaimed in any given situation where a decision between two options has to be made.
Bruce: "Eeeeyy cobba you want us to pick up box o' fruity lexia or medium dry?"
Shane: "Don't give two fucks Brucey, por que no los dos?"
by Charles Wolfgang Prior June 22, 2014