Trucha, trout in English, is the slang term used in some parts of Spain which means homosexual, gay man, etc. Saying "Alberto is trucha" would be a less aggressive way of saying "Alberto is faggot". The origin of the slang meaning is not known with certainty, and the variety of meanings besides name of the fish, do not make easy to determine the reason.
In Latin America the word Trucha has several meanings as astute, shrewd person; a person who realizes what happens, gets trucha, but in Argentina and Uruguay Trucha means false or fraudulent thing. This last meaning could be the origin of the slang, understanding that a trucha man is a false man, a man who is not really a man, or is not man at all, social consideration that traditionally have had homosexual men. This explanation of trucha slang imply that this meaning traveled from Latin America to Spain and subsequently used to point at gay men, and this we cannot completely rule out, albeit is unlikely.
Located trucha in Spain we continue with the time at which this slang expression appears. Will most likely to be of fairly recent, from the second half of the 20th century, considering that the great writer Miguel de Unamuno in one of his works said that “ ... is must be a bit trucha in life and wary of anyone who ...” in the sense of bright, astute, etc. We do not see probably Unamuno had used this word if it had had this slang meaning.
From here, two possible origins for trucha as a faggot slang word are outlined. On the one hand we have the etymology of the word, considering that in its origin from Latin and Greek, trucha literally meant big swallower in feminine, and it is not dismissable that at some point began to be used to point at gay men for the issue of sucking and swallowing cocks and for the implied feminization.
On the other hand and relatedly, we have the feminization or identification patriarchal and the dichotomies, so present in traditional social vision of sexual diversity. The man is hard and cold, the woman is weak and hot. These categories that society dominated by men, the patriarchy, has established for centuries, have resulted in many cases to the attribution of female characteristics to homosexual men. Keeping in mind that the female has been socially stripped of non-reproductive sexuality, the sexual desire, the carnal desire, it was only of men, so women turned flesh, and following with the dichotomies, turned men into fish. Heterosexual men like meat and gays like fish. A greedy fish, a fag, the trout. La trucha.
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