1) Something that wobbles 2) Thing 
A tantrum or fit.
A crime that can be either a misdemeanor (a conviction punishable by a small amount of jail time, typically one year or less) or a felony (a conviction punishable by time in state prison). Wobblers can be charged either way, and depending on the law of their state, judges may have the discretion to reduce a felony conviction in a wobbler case to a ...
Wobbler is British slang for erratic, neurotic or extreme behaviour.
[n] - something that wobbles
noun something that wobbles