I was really impressed to discover that someone else uses this excellent term. I use it as a 'mild' expletive when something happens that slightly annoys or frustrates me.
'You are joking, we haven't got anothermeeting tonight have we? What a cock-on-a-stick.'
'Cock-on-a-stick, where are my car keys?'
The act of receiving oral sex from a female to the point where you are about to ejaculate so then you pull out and beat the top of her head with your dick while ejaculating all in her hair.