Going omph-pa-pa

While watching a news report on more knife killings in London I went, "Where are the parents of these young people carrying knives? Don't their parents care?"

I went on to say, "I know where they are. They are probably down in a pub somewhere."

To this my son chipped in, "Yeah! and singing omph-pa-pa."

He had just done Oliver! at school, right, and there is this scene in a pub where Nancy sings "Omph-pa-pa" to distract Bill Sykes so that Oliver could escape. So now son thinks that when grown men go to the pub, they sing "Omph-pa-pa".

Or does he?

Maybe it is just his way of saying how people enjoy themselves, forget themselves, in a pub. Who knows?