Chicken and a Dickin' is to perform anal to another person whilst they proceeds to consume some form of chicken fast food (kfc, nuggets etc.). The person performing the anal can also consume chicken produce but it isn't necessary.

A euphemism for “kill me” now that composting oneself after one’s death has become popular.

When he takes you to KFC, and orders a bucket meal then takes you home, you both eat all the chicken then he places the bucket upon your head, and gives you a dickin