I'm half way across the world, it just occurred to me
I look down, wallet full of foreign currency

from B.o.B (Ft. Playboy Tre) – Fucked Up Lyrics on Rap Genius

Meaning

He was so drunk that he didn’t realize that he had exited and entered another continent, and he only realizes it when he looks in his wallet for booze money and finds foreign money in it.

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