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1.
Scottish slang for a Barbie ayrshire girl,chav'et thats always looking in the mirror and taking photos of herself and touching up her makeup.
Oh your such a posser.!!
by br4v3hrt April 27, 2010
 
2.
An old implement which was used for hand-washing clothes. It consisted of a copper dome full of holes attached to a long wooden handle.

A dolly could also be used for the same purpose, but this implement had several legs radiating from a wooden disc (looking rather like a small stool), and the long handle had a handle-bar arrangement at the top for maximum leverage.

A person exhibiting foolish or flighty behavior might be likened to a posser-head.
Before twin-tubs you had to use a posser and a mangle.
by JCooke May 29, 2006
 
3.
The act of throwing a huge party where the entire population of the city and surrounding area (200,000) are invited. Possers usually get broken up within 2 hours or less, and mass amounts of blood is shed. SWAT will be informed of a posser, and head to the posser house immediately. The owner of the posser house will usually go to jail.
Guy, were you at posser 06'?

Hey, I know you, I was at your posser last year!

No parents?!? Guy have a posser!
by Brett Butler June 21, 2007