I'm hot
Like a cauldron from a warlock
Wearing sweatpants in a sauna

from Macklemore and Ryan Lewis (Ft. Macklemore) – Castle Lyrics on Rap Genius

All these situations now signify how hot he is. This is an example of interesting imagery due to the contrasting examples of how cold he is in the previous lines. This is not a contradiction though, as most people know something can be so cold that it actually causes a burning sensation on the skin.

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