A is a whimsical, unofficial slang term combining the British vulgarism "bollocks" (meaning nonsense, testicles, or an exclamation of annoyance) with "doodle," a playful word often used for scribbling or as a child-friendly euphemism for male anatomy.
Describing a drawing or design project that has gone completely wrong. "I tried to sketch a horse, but it turned into a total bollocksdoodle." bollocksdooodle
If you provide (where you saw it, what you need the guide for), I can give a more specific, useful answer. A is a whimsical, unofficial slang term combining