This can be used to describe outrage or disgust in a conversation while wanting to be well mannered at the same time. At a point where it may not be appropriate to use the phrase "What the Fuck" you may use "What a load of Faddyrucker"
A second definition can be used to point out a lie or distruth as in:
Man 1 "I won the lottery last night"
Man 2 "What a load of Faddyrucker!"
A Third definition can be used to describe something as bad or of poor taste. An expressive dismay over a film/book/TV show etc. when swearing may be inappropriate.
When the quantity/variety of food in a kitchen, at party, or in a restaurant filled area makes it impossible for you to decide what you are hungry for.
Joe got some serious FADD when he reached into the fridge for some salsa, only to find that they still had some of that Nutella.