Definition of "ruckly"

I min' when they were jist auld sort o' ruckly boxes, awfu' licht, ye ken, upon the springs, and just went dodderin' alang, the body swingin' to and fro, as if it would flee richt oot.

1979, Reincarnation: the best short stories of R. B. Cunninghame Graham, page 70

I grip the bike rack with both hands, but then the track gets rucklier so I steady myself by hooking one thumb through a belt-loop on Brubeck's jeans.

2014, David Mitchell, The Bone Clocks, pages 27–28

It meant ruckling his sock right down, and nobody likes a ruckly sock, but this was no time to be stopped by a ruckle.

2015, Georgia Pritchett, Wilf the Mighty Worrier: Saves the World