Nah, dipstick's not a bad word at all. I know what you're probably thinking of, but Miiverse blocks most swears anyway. Dipstick has two meanings that I know of. The first is a long slender stick that's dipped (See where the name comes from?) in the part of a car's engine where the motor oil goes to check the oil. The other meaning is idiot. That's the one I used here because the guy was an idiot.