What did that Sunil Shetty Knock Knock joke mean?

Hi Huku Hi Huku Hi Hi or Haye Hukku Haye Hukku Haaye Haaye is a song from the film Gopi Kishan (1994)

The film stared Sunil Shetty, Karisma Kapoor, and Shilpa Shirodkar.

Golden rule of the 90s was that the number of heroes and heroines in the film needed to tally up.

If not, the excess character would die at some point.

This film had Sunil Shetty playing a double role - a thug and a cop (hence tallying up).

The neat thing was that the cop was a weakling and Sunil Shetty's first real feature film playing a comic character.

Here's the song: