rumpty

A nonsense word, especially in simple or childish songs.

I sang it through, "Rumpty tumpty toddy man," as Grandpa thumped his blackthorn stick against the floor and everyone laughed.

[…] he heard a distant sound, or song, behind him. "Rumpty didily dum. Rumpty dididly doo. Rumpty doo doo dumpty didily rumpty didily dum."

Of a quality below standard; in a state of disrepair.

I lived in a fringe of the city, down Happy Valley Road, in a bit of a rumpty palace of a house banged together by some DIY no-hoper.

A Farman airplane.

In his initial assignment to Training Squadron No. 4 of the Royal Flying Corps, Field began his flying in the Maurice Farman "Shorthorn" trainer, sometimes called a Rumpty. […]

To do him justice, there were a few wires which he did not loosen in climbing into the cockpit, but then the machine, a Henri Farman (or Rumpty as they were commonly known), was at all times hard to get into.