@Edna
When anyone is learning Spanish or any other language, words, anyone could come across and can’t find the meaning for, can become important if a language learner is learning with the goal of becoming fluent. This other forum is a Spanish learning forum, and I had a gut feeling this person may have been frustrated that no one had answered yet
I was rereading this post, and it reminded me that when I started out learning foreign languages and I was in the habit of looking up every single word I did not know. Since we went from reading short stories into novels and everything in between, our professors explained the little benefit that had in the big picture of things because there is so much to learn in terms of words and structures that are key to actually communicating effectively in the target language, that using ones precious time in trying to figure out what an odd word of expression like ¡qué fuñenga! exactly means is not the wisest approach to take.
Also, in the ¡qué fuñenga! case if there wasn’t much information on the Internet, and if a native speaker and linguist like me do not know it, it should tell you it is not a really important expression.
That is why I asked you if that person was working on a paid translation, in which case every word needs to be translated because you have to come up with a complete translation. But even then, if it’s not a manual or instructions for anything, I am sure ¡qué fuñenga! is totally irrelevant in most cases.
In regard to fluency, ¡qué fuñenga! will not help anyone become more fluent at all. Take my word for it.
But, sure, like I said before, we try to help everyone who might get frustrated looking for info on an expression, but not finding much information about it should give you a clue as to how frequent and important that word or expression is.