To shit in a Bidet. Whether a drunken misunderstanding, or an act of malice, a 'Cheeky Kofta' is named as such due to the visual similarities between a lamb kofta presented on a pristine white plate, and a bidet after someone has layed some pipe.
'McNultys just left a cheeky kofta in the girls bathroom!'
'Honey, someone left a cheeky kofta in our bidet last night'