Good question! Because it is used incorrectly very often. My wife is even called a "guy" by many waiters or waitresses! And often when she is with other women, they are called "you guys." Or a group of young girls and boys are called "you guys." Slang used too often and too incorrectly is like a river that has flooded way beyond its banks, ruining a lot else. I tell my students who are studying to be teachers that if they never use the word, no one will complain, no one will miss it, and no one will remind them to use it, because it is so unnecessary. It is OK once in a while, though, as in Frank Loesser's hit Broadway musical, "Guys and Dolls." There's a great use of the word! But none of the dolls in the show are called guys, for they knew to use the word properly back in 1950. And Americans who talk well now do not much use it.
I hope that helps!
Just for grins, for the benefit of "Equand" and me, could/can some approach a translation for any or all of the following phrases? [Thanks in advance for taking on this project!]
-He is certainly a tall man.
-He is a uniquely tall man.
-He is the tallest of men.
-He is such a tall man.
-That man is so tall. [ET CETERA . . . . ] N. k. s.!
I can try.. :)
He is certainly a tall man. - Ő tényleg egy magas ember.
He is a uniquely tall man - Ő egy különlegesen magas ember.
He is the tallest of men - Ő a legmagasabb ember.
He is such a tall man - Ő egy annyira magas ember.
That man is so tall - Az az ember annyira magas.
Notice that I always used the ő, because in this context i's used as pointing a finger towards him. I can accept leaving it out only in the first sentence I think.