Rumdumdaddy is apparently a 5000-year old warrior that a Pkunk named Braky (most likely no relation to Braky Girdy I) managed to make contact with and channel while scrying through some form of spiritual plane. He apparently informed the Pkunk that the various spirits had been so busy answering summons, pushing around glasses on Ouija boards and acting as guides to spiritual travellers, that they didn't have any time to themselves and weren't paticularly pleased about it. He proceeded to complain that the Pkunk should all be a bit more respectful of the dead, and leave them alone for a change.
Evidently this warning did not faze the Pkunk at all, as they also reported to The Captain (who had been humoring the Pkunk's apparent psychic abilities with various requests) that since Rumdumdaddy's complaint, they hadn't had much co-operation with the spiritual world. Given the playful and whimsical nature of the Pkunk, the truth of this anecdote is questionable.