Fucking for some is a peculiar way of life, widespread among secular young people. By "dude" they mean a fashionable, naive young man who does not shine with his mind.
Defenition of the word dude
"Dude" from French translates as "dove." This is an “empty smarty young man, ” according to a dictionary of foreign words. It is easy to draw an analogy with a pigeon: not a very smart bird that can show off and inflate its chest. Sometimes a dude can be called his good friend, using a slight irony or good-natured mockery, but in general this word is negatively colored. “Dude” is neither a compliment nor a merit, with this word you can express your disapproval of the frivolous dude, give a negative assessment of his appearance - or, rather, excessive obsession with him, and unreasonable, superficial behavior.
There are several more synonyms of foreign origin for the word "dude": "smart" - also from the French word, or the English version - "dandy". Remember at Pushkin: "How London dandy is dressed."
Another meaning of the word "dude" is a person who can be easily deceived, often due to inexperience and young age. Card cheaters have jargon definitions for “dude strong (whole)” - the victim who first encountered fraudsters, and “dude torn (spoiled)” - the victim who had already been deceived once.