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Everett is no come-on or a rube
(fedia.io)
A place to appreciate the twentieth century comic character Everett True of "The Outbursts of Everett True." Feel free to check out the sticky.
Looks like there's a generic sense of "Someone advertising for customers in an aggressive way.", but even more relevant here it can mean "A person, at a racecourse, who offers supposedly inside information on which horse is likely to win."
Looks like that horse racing use was also interestingly closer to the original use of the word. Fun that it was a thieves' cant as well.