skuldugger means to partake in skulduggery (dishonest, underhanded, or unscrupulous activities or behaviour). Lexicurio rates it Sui generis — a strength score of 100 out of 100.
verb
- To partake in skulduggery (dishonest, underhanded, or unscrupulous activities or behaviour).“I am not a man to waste energy in hurt feelings. "I assure you I have no intention of skulduggering around to learn the new receipt," I told him. "It was only a suggestion."”