Meaning: ambient or surface temperature is extreme
Rewrite 1: hot enough to steam an egg
Rewrite 2: hot enough to fry a burger
Rewrite 3: hot enough to grill a cheese sandwich
Rewrite 4: hot enough to broil a steak
Rewrite 5: hot enough to melt steel
Rewrite 6: so hot you could prep s'mores on the sidewalk!
Comment: It's usually said to indicate how hot a surface is, such as a sidewalk or car hood, but it could also apply to how hot the air is or how hot the day is.
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More about food and drink in speech
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