The story
From crinkle (“to rustle, as stiff cloth when moved”) + pants, because many disposable adult diapers have a plastic backing which makes a distinctive crinkling sound. Compare crinkler.
Etymology from Wiktionary, CC BY-SA 4.0.
crinklepants
crink·le·pantsToday it means: A term of endearment for one who wears a diaper; a crinklebutt. Full definition →