If there were such a name it would be "Tequilamelon" or "teqmelon."
I believe you are asking if you can spike a watermelon with tequila? If so,
please see this forum thread.
[Kent Garber] Re: alcohol + watermelon
Just substitute any reference to liquors/alcohols with tequila.
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This web site features Tequila Spiked Watermelon Soup
http://recipe-appetizer.com/31/167366.shtml