A similar thread was made years back. However, I still see people misuse that word. Listen, Sambo was the sellout NOT Tom. Tom would NOT die in vain. Meaning, he was going to die for his fellow man (slaves). Yep, our people in real life still use that word
Some know the original novel Uncle Tom's Cabin which came out in the 1850's, the man Uncle Tom was a slave a who was killed because he didn't give up fellow runaway slaves. Only problem was the novel got real popular.
White folk didn't like the idea of main character of a popular book being an anti-c00n black slave, especially while during slavery. So they changed the narrative in many ways such as rewriting the book, doing minstrel shows starring Uncle Tom, etc. since it was before the Copyright Law of 1856. They then changed mainstream's version of Uncle Tom as an obedient, subservient, willing to please his master at all cost type of slave. Basically, what we know it as today.
African was born into slavery, who ended up sacrificing his own life to save the lives of other slaves. But, when this story was made into a movie, Uncle Tom was portrayed as a slave who gave his life for his master.
Uncle Tom - Wikipedia