chainsuck noun in mountain biking, a condition that occurs when the bicycle chain doubles back on itself and gets jammed between the frame and the chain rings US
Muddy water washes the lube from the chain, which leads to chainsuck, so lube your chain before and after every ride[.] — MountainBikeMagazine’sCompleteGuideToMountainBikingSkills, p. 126, 1996