The Collaborative International Dictionary of English v.0.48:

over-the-counter \over-the-counter\, over the counter \over the
counter\adj.
   Grossly excessive; outlandish; well beyond normal; as,
   over-the-top action films. [informal]
   [PJC]

The Collaborative International Dictionary of English v.0.48:

over-the-counter \over-the-counter\ adj.
   1. able to be sold legally without a doctor's prescription;
      -- of medicinal drugs. Contrasted with prescription.
      [prenominal]

   Syn: nonprescription(prenominal).
        [WordNet 1.5]

   2. (Finance) not quoted on a stock exchange; sold only
      through private negotiations between buyer and seller; --
      of securities; as, over-the-counter stocks.
      [WordNet 1.5] over the top

WordNet (r) 3.0 (2006):

over-the-counter
    adj 1: purchasable without a doctor's prescription;
           "nonprescription drugs"; "an over-the-counter cold
           remedy" [syn: nonprescription(a), over-the-
           counter(a)] [ant: prescription(a)]
    2: (of securities) not traded on a stock exchange; "over-the-
       counter stocks" [syn: over-the-counter, otc]