When you trundle something, you move it or roll it awkwardly. You might have to trundle your broken suitcase down the stairs if you can't find an elevator.
When a person trundles, they move slowly and heavily. As a noun, trundle means "a roller," and it usually refers to something on wheels that can be moved around, like a trundle bed, a low bed frame you can slide and store beneath a taller bed. You might roll out the trundle bed when your friend sleeps over, and then try to fall asleep as you listen to your brother trundle around the kitchen looking for a midnight snack.