AMS Syndrome is "ATM Machine Syndrome Syndrome" - the condition where someone says the last word of an abbreviation after the abbreviation. eg: "ATM Machine" or "SCUBA Apparatus".

The second "Syndrome" in the name is, obviously, required.
"Where's the nearest ATM Machine?"
"Do you mean the nearest machine that makes ATMs, or do you just have AMS Syndrome?"
by ASCIIaardvark April 30, 2015
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A phenomenon which leads one's English (or whatever language one speaks) to either become less controlled or logical than usual or archaic and verbose; it also causes one to say things one wouldn't ordinarily say. Often quite embarrassing, this syndrome is most evident in those who chat or speak with friends or relatives in the wee hours of the morning.
Deb: I'm sorry about last night!! It was late, and I don't know what I was saying!
Pedro: No worries--I'm sure it was just the 4 AM Syndrome.
by BostoniensisXX August 8, 2013
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