How awful sounds "what's her/his face"? I was wondering if I use this expression would be unpolite (extremely I mean) or disrespectful. I know you can use it when you don't remember someone's name. We have an equivalent in Spanish "como se llama" (what's its name) and it's related to things not to people. Some examples: profesora se ha perdido mi como se llama. Teacher my what's its name is lost. Thanks for your help folks