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