While you're jerkin' your dick catchin' mad callouses

from RZA (Ft. Masta Killa & Tash Mahagony) – Koto Chotan Lyrics on Rap Genius

Meaning

RZA warns that chronic masturbation can cause the skin of one’s hands, or penis, or vagina to become covered in calluses, tough areas of skin caused by constant friction.

the callused hand of a habitual (southpaw)masturbator:

Whoever uploaded this song used the word ‘callous’, which basically means ‘emotionally hard’. Masturbators are often cold, emotionless sociopaths.

Being the wordsmith and rap psychologist that he is, RZA no doubt intentionally included this homonymn into the song.

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