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

Image file not found(ImagePath:/volume1/web/wordpress/http://192.168.0.15/wordpress/wp-content/uploads/2009/08/xxx-root-beer-sign.jpg)

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