My nigga cheated on his girlfriend with his girlfriend's girlfriend

from Kendrick Lamar (Ft. Ab-Soul) – Ab-Souls Outro Lyrics on Rap Genius

Meaning

His (childish) friend had relations with his girlfriend’s good friend. Not real man material for Tammy, as mentioned in the previous two lines. Either this, or a similar situation is also referenced on his song, “Double Standards”:

Head saying no, other one saying yes
His girl girlfriend been with it, it’s scandalous

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