Hawohh

Said in an Elmar Fudd-like voice and used by an employee to their boss as the first word spoken when attempting to phone in sick

Hawohh is the first step in sounding sick in order to be perceived sick. You must ensure a whoozy, almost ready to vomit speech pattern so that you can off the phone quickly and back to your video game. Add some additional gems such as "I've been up all night" (at a bar) and "I've been on the toilet, it's coming out both ends (note you didn't say which ends!)