What is the meaning of Ahem?

The sound of a quiet cough or of clearing one's throat.

An exclamation or cough to get attention.

An exclamation of disapproval or annoyance.

An exclamation to indicate sarcasm.

This term needs a definition. Please help out and add a definition, then remove the text {{rfdef}}.

To cough or clear one's throat so as to draw attention.

Source: wiktionary.org