Scrambling 2NT
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The scrambling 2NT bid is used after partner makes a 
takeout double at the two level, and you hold two four 
card suits.  

E.g. (1S)-p-(2S)-x; p- ???  and you hold  S: Kxx/ 
H: Qxxx/ D: Jxxx/ C: xx.  If you bid hearts, you could
wind up in a 4-3 fit (and the same with bidding diamonds). 
Why guess?  If you bid 2NT as a scramble, partner can bid
his four card suits up the line.  With  S: xx/ H: Kxxx/ 
D: AKx/ C: QJxx  partner bids 3C over which you bid 3D 
to deny holding four clubs and then partner bids 3H to 
show that suit.  

Why play this convention?  
* First, you and your partner may make more agressive 
  doubles knowing that you can find your 4-4 fits safely.
* Second, if partner does not go thru Scrambling 2NT, 
  then the doubler will know that the suit is a five 
  card or longer suit. 
* Third, what else is 2NT supposed to mean?  Natural?  
  Why not just pass their doubled bid then?