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1.
The action of preventing a person from retiring to bed. Common pinnering tactics employed are:
1) to physically restrain the person being pinnered (henceforth referred to as the 'pinnee')
2) to ask the pinnee to retell everything that has just happened in a film being watched then asking what was missed during the explanation (repeat as necessary)
3) initiating a 'who kissed whom' argument

N.B: Pinnering should only be undertaken in a controlled and supervised environment.
"Hey girl, you look quite tired today."
"Yeah, dave had me pinnered all night."
"Boss."
by Gabe Karellen September 24, 2009
 
2.
really small, very little, extremely thin. Other spellings: pinnard, pinnerd.
That joint was really pinnered
by Steven Schreiner June 23, 2007