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1.
unit of measurement which is 9 inches.
there are however local variations to this, the 9 inches quoted is generally recognised in England UK. but for example in Asia a cock lengtht is only recognised as 4 inches and in most African country's a cock length is claimed to be 11 inches but recent research (by my wife) shows this to be an exaggeration.
when wanting an 18 inch length of wood john shouted
"Richard pass me a piece of wood please"
"how long ?"
"about 2 cock lengths"
by breast inspector February 12, 2013
 
2.
A general unit of measurement used to describe relatively long objects. The opposite of a c-hair.
'When installing the underground sprinkler system, John used a half a cock length of pipe to get from the garage to the curb."
by Roger DeCoster September 13, 2005