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1.
Used notably by the fictional character Mark in the English television programme “Peep Show” as an expression of frustration or feelings akin to.
While attempting to hack into a friend's email, Mark loses his patients and blurts "cocknobs"
by Sethbot May 15, 2007
 
2.
A selection of penises, used as an expression of frustration
"Oh Bugger... Oh COCKNOBS!"
by Armos August 09, 2006