It's hard to think of off the top of my head because I admittedly have not gotten into a lot of the more popular examples, and a lot of them mix together, but a typical indication that someone is using the term wrong is if they try to point to evidence inside the show of how the couple should be canon because they have so much chemistry but the creators just won't commit and make it canon. Those are typically just people wearing shipping goggles using the word as a way to say "I want them to be canon, therefore they SHOULD be canon, but they're not, so it's queerbaiting" even though the creators have never at any point indicated that the two characters will ever be in a relationship in advertising, interviews, previous drafts of the script, or otherwise, and at most the actors may have joked about how the ship is popular or mentioned that they personally enjoy it (which isn't the same as using it in marketing or promotional material or teasing the possibility of it becoming canon). Queerbaiting can also take place even if a couple or sexuality DOES become canon if it's halfassed or skimmed over or done poorly. Some famous examples of this are Shiro and his relationships from VLD and Destiel from Supernatural.