A use of the interjection, ahem.
The sound of a quiet cough or of clearing one's throat
An exclamation or cough to get attention
Ahem! Could we please get started?
An exclamation of disapproval or annoyance
Ahem! In case you didn't notice, I did my share, too.
An exclamation to indicate sarcasm
I really (ahem!) liked the chocolate broccoli surprise.