wobbler

One who or that which wobbles.
(curling) A stone that rocks from side to side as it travels because it is not resting on its running surface.
(colloquial) A case that could go either way depending on factors that cannot be controlled.
(colloquial) A class of crime that can be charged as a lower penalty or a higher penalty, e.g. a crime punishable as either a misdemeanor or a felony at the discretion of the prosecutor.
(fishing) A fishing lure made to resemble a prey fish and that wobbles in the water; plug, minnow.
(slang) A sudden unexpected outburst of anger or rage; a tantrum.
(advertising) A small publicity notice which appears to float at eye level, being attached to a fixture by a flexible arm.
The end of the roll in a roller mill for shaping steel.
A boiled leg of mutton.