I believe it's, "everybody get laid, get fucked."? I'm not sure where it came from exactly or why it's sung, but it is.? Crazy kids, and it fits quite well.
Billy Idol does it live. Its on the live version of the song he does.
I saw billy 2 years ago(amazing show by the way) and he sings it like "here she goes now I say mony mony everybody get laid, get fucked"