No, it does not lack a translation. It means “you, too” in Latin. And the logical fallacy is hypocrisy - that a person is doing what he is accusing the other of doing.
That is a word for word translation, but in my opinion does not quiet express the fallacy that gives title to the expression.
From the site “Logical Fallacy.”
“Tu Quoque is a very common fallacy in which one attempts to defend oneself or another from criticism by turning the critique back against the accuser. This is a classic Red Herring since whether the accuser is guilty of the same, or a similar, wrong is irrelevant to the truth of the original charge. However, as a diversionary tactic, Tu Quoque can be very effective, since the accuser is put on the defensive, and frequently feels compelled to defend against the accusation.”
It would be hard to grasp that all from the literal translation, so if one does not know it looking it up is the best response. I had to look it up, since it has been many years since I had any logic classes.
I’m going to have to pick a fight with you, RM.
“Tu” can be translated as “you,” in general, and “quoque” can be translated as “also.” But the phrase “tu quoque” is a term, which, when translated as such, loses its meaning.
“Hypocrisy” is not a logical fallacy; it’s a commission. Tu quoque is the name of the logical fallacy which is an appeal to hypocrisy. To accuse, “to quoque” is not accuse someone of hypocrisy; it is to accuse someone of using the charge of hypocrisy as an ad hominem attack.
(For those who hate the use of Latin terms for logic, “ad hominem” is a term for an illogical argument which falsely supposes that since a person may be flawed, his argument must be.)