High Test Booze or Porno Drive-Through?

Summer time in Washington means people hurriedly taking advantage of rain not falling from the sky.  Back when I was living the car life, it meant a whole lot of car shows at XXX Root Beer in Issaquah.  After a while, the cars all look the same, as do the folks who spend their time bringing them out.  In the end, however, I always liked the sign.

XXX Root Beer Sign

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I just never figured out the XXX part.  Strong like booze strong?  Dynamite strong?  Porno strong?  Any theories?