Got me at cancer and Massachusetts, I'll be throwing in the Boston crab

from Slaughterhouse (Ft. SLV) – Who I Am Lyrics on Rap Genius

Meaning

The symbol for the cancer constellation/zodiac sign is a crab, and Boston is in Massachusetts

The boston crab was a submission move used in professional wrestling

it looks similar to this, the walls of Jericho, which is just an elevated version of the boston crab

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