bobble (v.)

1812, frequentative of bob (v.1). The notion is "to move or handle something with continual bobbing." Related: Bobbled; bobbling. Bobble-head as a type of doll with a spring-mounted head is from 1968.

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Definitions of bobble from WordNet
bobble (v.)
make a mess of, destroy or ruin;
Synonyms: botch / bodge / bumble / fumble / botch up / muff / blow / flub / screw up / ball up / spoil / muck up / bungle / fluff / bollix / bollix up / bollocks / bollocks up / mishandle / louse up / foul up / mess up / fuck up
bobble (n.)
the momentary juggling of a batted or thrown baseball;
the second baseman made a bobble but still had time to throw the runner out