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

from Kendrick Lamar (Ft. Ab-Soul) – Ab-Souls Outro Lyrics 1 on Rap Genius

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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