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8.
Repeated attempts by two or more males to prove which one is bigger or better than the other in any given way. This can be anything from terse email arguments to a refusal to get of a gym exercise bike until the person next to you has.
Hey Buster, did you see that email cock off between Russell and Ken... man Russell missed all the points completely, he really is a one incher.
by Hoo Rider July 18, 2005
 
9.
Like to fuck off with a little less gusto.
All those wearing red shorts can just cock-off.
by Nerdo September 18, 2003
 
10.
When one does something stupid, wrong, they should 'Cockoff'.
Just Cockoff you twat
by 90Nz0 August 14, 2003
 
11.
A humungous backside you could rest a cup on
'Wow!!! her cock off is immense!'
by nangishpasty February 05, 2010