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Like on the Itsy Bitsy Spider I heard it in some lyrics but I don't know what this mean indeed.

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closed as general reference by Mehper C. Palavuzlar, Mitch, Callithumpian, waiwai933 Jan 16 '12 at 17:28

This question is too basic; it can be definitively and permanently answered by a single link to a standard internet reference source designed specifically to find that type of information.If this question can be reworded to fit the rules in the help center, please edit the question.

Have you looked up in a dictionary? – Mehper C. Palavuzlar Jan 16 '12 at 16:37
up vote 2 down vote accepted

"Itsy bitsy" simply mean "tiny" or "very small".

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I had an answer ready when it was closed, so I'll post it here. – John Lawler Jan 16 '12 at 17:33
It's the conventional way of representing (supposed) children's language, like Gramma for Grandmother. "Itsy bitsy" and "teeny weeny" both mean 'very small'. The first is (supposedly) from little bit and the other is from reduplicated and vowel-raised tiny. – John Lawler Jan 16 '12 at 17:33
I.e, supposedly the sequence went from a little bit of X as a quantifier, to little bitty X as an intensified adjective, to itsy bitsy X as a juvenile version. – John Lawler Jan 16 '12 at 17:33
Teeny weeny went from tiny to teeny to teeny tiny to teeny weeny. Perhaps. Nobody was taking note at the time. – John Lawler Jan 16 '12 at 17:34
@JohnLawler, Yes, I was well aware of all those facts before I posted the three links to wikipedia articles, and in fact knew that the pre-1960 covers of Itsy Bitsy Spider could not be covers of 1960 copyrighted popular song "Itsy Bitsy Teenie Weenie Yellow Polka Dot Bikini" which is described in first link. The third link discusses several versions of folk song Itsy Bitsy Spider from early and mid 1900's. Naturally, when you wrote "itsy bitsy is a fixed phrase, with its own famous song" I assumed you were referring to one of the above songs. – jwpat7 Jan 16 '12 at 20:37