Strength of a retard the drugs are even stronger
from Action Bronson – 9-24-11 Lyrics 1 on Rap Genius

“Retard-strength” is the supposed physical ability that a mentally handicapped person possesses over and above that which a “normal” person could achieve. The basis of this is most likely the fact that mentally handicapped persons have diminished ability to regulate their energy output based on social rules because they don’t understand them. This is why a developmentally disabled person might take things too far when play-fighting.
Action claims that the drugs (either that he is taking or that he is selling) are even stronger than the ridiculous strength of a “retard”
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