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Guillaume went on to explain that, actually, "hot like Mexico" and "cool the bad" are references to the lyrics of the Lady Gaga song "Alejandro." Guillaume had assumed that this was common knowledge, at least until I pointed out to him that the set of people with a high degree of fluency in Lady Gaga lyrics probably shares little overlap with the set of people who read Darwin Eats Cake.
Anyway, Guillaume felt bad about the misunderstanding, and asked me to address it here.
On a related note, Guillaume's Mailbag is still accepting submissions. Send in any biological trait of any species, and Guillaume will provide an adaptationist explanation for its evolutionary origin. You can reach him at firstname.lastname@example.org.