A Turncoat Thomas is someone who pretends to be a likeable guy, hoping that people will open up to him and let him in on their secrets. A Turncoat Thomas will then use these secrets for his own benefit, for example by stealing your girlfriend or sucking up to his superiors at work by betraying his co workers.
- “I got fired today for coming in late but nobody noticed...! That f***king Turncoat Thomas betrayed me!” “Well, you shouldn’t have told Thomas, Danny...”

“I’m sorry but I am dumping you Danny, Turncoat Thomas sent me a DM on Facebook and told me all about what you guys did last weekend! You **shole! And yes, I am going on a date with Turncoat Thomas this weekend...”
by DannyCaruso1988 March 7, 2021
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