moochin
A difficult or disagreeable person, especially a child.
He sat down in the road. ‘I'm on a sledge,’ he said, ‘pull me, Patricia, pull me like an Eskimo.’ ‘Up you get, you moochin, or I'll take you home.’
Where it comes from
Alteration of Welsh mochyn (“pig, greedy or immoral person”). Of disputed origin.
Adapted from the Wiktionary entry moochin (CC BY-SA 4.0).