The vegetarian version of 'Wolf Bagging'. (Note the vegan version has never been attempted as most vegans are virgins + creme is normally involved in the latter stages of 'Cheese Bagging').
During anal sex, the male takes charge of a large block of mature Cheddar cheese and at the point of ejaculation pounds the Kidney area of his partner with hard cheese. The more mature the cheese the greater the sensation (See also 'The Gripper', 'Slackers' and 'Silverback').
This in turn makes the victim retch and the anal cavity constrict increasing pleasure for the Cheese Bagger. This is Cheese Bagging.