We used to cut school with her and run train

from T.I. (Ft. B.o.B, Kendrick Lamar & Kris Stephens) – Memories Back Then Lyrics on Rap Genius

Meaning

To “run train” is sex as a team-building activity (one after the next like train cars, get it?). It was more interesting for T.I. and his friends than seventh period Chemistry.

Sorry y'all, no picture…

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