Came home late I just put the key in
It would probably be straight if she was european

from Big Boi (Ft. Kid Cudi) – She Hates Me Lyrics on Rap Genius


His girl is not okay with the idea of him coming home late.
Possibly due to the stigma of men who come home late being cheaters.

He is saying that white girls are much less likely to feel this way or be suspicious.
Continuing the double meaning of house/girl, he could also be talking about how european girls see sex as opposed to american ones

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