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To be just the right height, so that no bucket is required.
Relates to fucking horses or any other large animal where the entry hole is too high for a normal human, and a bucket is thus required.
"I happen to have a pony mare that is JRHNBR, and that's really nice because you don't have to do a balancing act standing on something."
by Truddleburgs April 21, 2010
Just the Right Height, No Bucket is Required
Maregasm - JRH NBR
by lrayne June 02, 2011