My lines are hot enough to make the toxins burst out the thermometer

from Nino Bless – Meagan Good Lyrics on Rap Genius

Meaning

A thermometer is an instrument for measuring and indicating temperature. For a thermometer to blow up, the temperature would have to be very direct, and hot!.

With that being said, he is saying is rhymes are very good, for those who don’t know what hot refers to.
http://www.youtube.com/watch?v=z96VCR5Ispk

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