Aphrodesiacal elixr made from the crushed body parts of the blister beetles Cantharis vesicatoria or Lytta vesicatoria. Purported to arouse those that ingest it. Toxic in large quantities.

Any arousal stemming from Spanish Fly is mild and not at all like the Beastie Boys would have you believe.
Put some Spanish fly in her drink and she'll be crawling all over you (you wish).
by Orius September 03, 2002

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