What's the meaning of 'Whatever tickles your fancy'?

[Twilit1988]

1 :I read this on a newspaper, ''Extra uniformed and plainclothed police have been deployed in various residential areas and tourist-spots to track dowd the man'' Is it correct?As far as i know we shouldn't use the plural form if we use hyphen between two words?
2 : ''Whatever tickles your fancy'' means?
3 : ''They are my arch-enemies'' correct?

[Mister Micawber]

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1-- A hyphen is fine with plural nouns (I think you may be thinking of adjectives-- a '10-minute break'). However, here it seems odd.
2-- Whatever you like
3-- Yes, but rather stilted unless a superhero is speaking.
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Native English teacher at Mister Micawber's