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1.
The part of a restraint system (seat belt, harness, etc) that goes between the legs. commonly refered to as a "croch strap".
When I went on the sky swing, the seatbelt included a nookser to keep me from sliding under it.
by BlinkingBlythe August 26, 2006
 
2.
Nookser (newk ser): The part of a seat belt, harness, or other restraining device that goes in between the legs.
When we took a ride on the sky swing, there was a nookser that prevented us from slipping under the seat belt.
by BlinkingBlythe August 27, 2006