Top Definition
A term used when people choose to go to bed early and don't go out on nights out with the rest of the house, commonly misunderstood as an insult this is a term which has no maliciousness behind it.
Examples of a flat oner would include the girls in flat one, Rebecca, Jo, Gabriella, Charlotte and Kirsteen
#flat one #house 37 #flat one-er #flt one #flt oner
by house 37 January 18, 2011
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