Wormy means full of worms or damaged by worms. When you bite into an apple and discover tunnels carved through the flesh, that's a wormy apple. A wormy piece of wood has little holes and channels where insects burrowed through it.

The word also describes anything that resembles a worm in appearance or movement. A wormy line might twist and curve like a worm crawling across the ground. A dog with a wormy gait moves in a slinking, squirming way.

Sometimes people use wormy to describe a person who acts sneaky or untrustworthy, someone who wriggles out of responsibilities or squirms their way into situations where they don't belong. If a character in a story makes excuses and avoids taking blame for something they did wrong, another character might call their behavior wormy.

In all these uses, there's often a sense of something unwanted or unpleasant. Nobody wants to find a wormy tomato in their garden or deal with someone's wormy excuses. The word carries that wriggling, uncomfortable feeling you get when you actually see a worm, even though worms themselves are helpful creatures that enrich the soil.