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Narrow behind is what ignorant, ghetto males and females call a butt, or booty, or ass, or rear, or whatever word you use for the muscle you use to sit.
"Sit yo narrow behind down!"

Is the same as:

"Sit down now!"
by JingleBellSongsAllDayLong October 28, 2008

Words related to Narrow Behind

annoying words ghetto humorous. ignorant slang