XD, the term "-itis" is derived from Greek and means "inflammation" in medical terms. For example Tonsilitis is an inflammation of the tonsils.
It is often applied incorrectly as a suffix to
made-up maladies (like "Get-home-itis") to make them sound like genuine medical disorders, or to describe something (as in this case) which would take a whole sentance to explain otherwise.
Of course, in this case it would translate as' inflammation of the get home', which makes no sense. However, although technically incorrect everybody understands to what Get-Home-itis refers....the desire to land and get home overrides potentially more sensible decisions.
No-one's mentioned "donkey" yet (or "donk" for short). I'm no expert, but I understand this to mean an aircraft engine. The engine is also referred to by my instructor on single engine a/c as the "air conditining unit" because when it stops mid-flight everyone on board immediately starts to sweat.
