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1.
A habit, action or object that would be considered inconsistent with one's personality; the one anomaly in a person's pattern of behavior.
Normally, he was an organized person, but his filthy desk was his green towel.
by TaroTart October 30, 2011
 
2.
used to clean up tooth paste and sprite. A very nice accessory to have hanging off your bed
Nathan has a green towel
by Corey Washington December 12, 2006