Division by zero is undefined in every case.
In calculus, the phrase “$0/0$ is an indeterminate form” means that you have a limit of the form
but $f(x)/g(x)$ is defined in a set having $a$ as a limit point (usually, but not necessarily, a punctured neighborhood of $a$) and nowhere you do $0/0$, which makes no sense. In this case you can apply no standard theorem on limits and the limit, if existing, must be computed with some different technique than simply substituting the value $a$.
Some say that the value of the fraction $0/0$ (no reference to limits) is undetermined, but this has no real usefulness.