Trump Derangement Syndrome, is the unwavering adoration and devotion to a political leader, beginning with Donald Trump the namesake of the disorder, extending to other forms of leadership including presidents and rulers typically of a fascist or populist nature. While the name is meant to have pejorative connotations the actual condition is characterized primarily by behaviors found in in "cult of leader" or "cult of personality" scenarios.

Trump Delusion Syndrome. The inability to find fault with Trump due to the fact that you voted for him in 2016. Also see: Cognitive Dissonance and Confirmation Bias.

Trump Derangement Syndrome
The mental derangement manifesting in right-wing supporters of Donald Trump who reject rational discussions of Trump's undeniable unfitness for the office he currently holds. Like Trump, TDS sufferers have a severe break with reality (that he is incompetent and unfit) and use various psychological coping mechanisms in pathological ways to avoid dealing with it. These include:

repression where TDS sufferers simply refuse to admit to facts

regression where TDS sufferers fall back on name-calling (i.e. the far, far left, communists, facists, radicals, America-haters, man-haters, white-haters ect.)

projection where TDS sufferers accuse rational folks of the maladies they and Trump suffer from (instability, poor work ethic, low curiosity, abject knowledge, pathological dishonesty, corruption, narcissism, unpopularity, racism, bias, prejudice, criminality, indecision, timidity and general poor mental and physical health)
whataboutism where TDS sufferers refuse to deal with facts about Trump's unacceptable behavior by switching the topic
deflection where TDS sufferers attempt to switch the focus to something other than themselves and Trump
equivalence where TDS sufferers attempt to claim that Trump and themselves are well within norms
exaggeration where TDS sufferers attempt to portray opponents as far outside norms
conspiracy groupies where TDS sufferers imbibe preposterous conspiracy theories that have been thoroughly debunked

It is short for 'Trump Dick Syndrome'. It is when you are a white boy so your dick is so tiny that you get angry for no reason and decided to take it out on easy targets like Syrian refugees and Mexicans.

The correct definition for "T.D.S" (trump Denial Sydrome) is when a trumper is totally delusional, ignorant and in denial of the fact that trump is a ignorant, racist, lying, cheating adulterer. Often caused by ignorance, inherent racism or being (as trump himself put it) "poorly educated"......

"Trump Dipshits". If someone is said to be "suffering from TDS", this means that the person in question is being harassed online by asshole Trump supporters.