Retard and retarded also have a legitimate definition and use in math, that has nothing to do with intellectual disabilities.

Fun fact: At least some airbus planes audibly tell pilots to retard when landing. It’s saying that the pilots should retard or pullback the throttle.

What it sounds like: https://youtu.be/vmbzKsqKQoI?t=26s

An explanation why: https://youtu.be/C2YjX-_g9k8