An extreme state of tiredness or lightheadedness in which someone would burst out laughing at anything and
everything, even if it isn't funny.
The phrase was named
after the "spoon test" - a method of diagnosing such a state. In the test, the word "spoon" would be uttered randomly and without context to
the person in question. If said person would burst out laughing, you know they're in a spoon mode.