The idiom always has a negative form: Do not eat a tail, like this other more traditional: Do not eat a donut, that is, do not reach what is intended especially in love issues. In the meadow of San Isidro the boys who did not flirt said that they had not eaten a donut. Then a Mecano song from the 80s says: " . . . I didn't eat a tail. These are just a couple of narrow ones and we went to sleep. . . "And the posh ones changed the threads for the colines.
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