Respect the code, a nigga's calling from the pen
Colombian neck-ties on the outside from within

from Game (Ft. Kendrick Lamar & Tank) – See No Evil Lyrics on Rap Genius

Meaning

A Colombian necktie is an execution where the victim’s throat is slashed (with a knife or other sharp object) and his or her tongue is pulled out through the open wound.

Someone is calling from prison (pen meaning penitentiary) ordering this execution method on a victim.

Note the play on outside and within.

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