What is One-track Mind?
1.
a mind obsessed with only one thing
That boy has a one-track mind. All he thinks about is his girlfriend.
2.
A mind obsessed with a single thought or perspective. Often used to describe someone obsessed with sex.
Rie, with her one-track mind, always manages to find sexual overtones in even the most innocent of statements.
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1.
As in "riding the grade mule."
One that rides the grade mule cares not about how much he or she absorbs and/or takes back fro..