Mr. fatigue

This morning one captain did not show up for duty. And he sent a text message to dispatch . "I'm fatigue, I Will come to duty on 0755". He was suppose to come on 0500 hrs so the aircraft was down for a while. The dispatcher did not know what fatigue is or what it means. So he told his co-dispatcher, don't worry there's one other guy come in on 0755 dhoani. Then the co-dispatcher asked who is he? dispatcher said some guy named fatigue.
Co-dispatcher: what???!!. fatigue ....
dispatcher: yes....
Co-dispatcher: it means he is tired.
dispatcher: really

Hope you learned a new word today.