Cop on

adv.

Heard in Tipperary, Wexford, Cork, Dublin and Galway

Usually said to someone who is acting stupidly or has said something stupid. One can add 'the fuck' to make 'cop the fuck on'.

In use

Tom: "Do you think we should breaking your man's windows?" John: "Will ya cop the fuck on will ya."

Posh English

Do you think we should be breaking that fellow's windows. Will you regain your senses will you.

Same phrase, other counties