|1.||Homemade Scotch Egg|
A sexual activity. Either;
1) Intercourse in an area which is so dirty, participants become coated in the surrounded filth and so are 'breadcrumbed'.
2) A manouevre similar in idea to the "Superman" in that a male masturbates and ejaculates onto his partners back whilst his partner is sleeping, and then affixes 'breadcrumbs' to the sticky patch he has created.
Homemade Scotch Egg? That sounds like some kind of euphemism....