Black body radiation situation that we workin' wit'
“Blackbody radiation” or “cavity radiation” refers to an object or system which absorbs all radiation incident upon it and re-radiates energy which is characteristic of this radiating system only, not dependent upon the type of radiation which is incident upon it.
See here for more details.
Stars behave a lot like black body radiators, making the wordplay appropriate here.
Mos probably just likes the sound of the phrase “black body radiation”, which seems to implicate both race and radiation, a well-known cause of superpowers in Marvel comics. Taken more literally, Mos may be suggesting that he absorbs the energy of those around him (this is a posse cut, after all) and re-radiates it outward to the audience.
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