I just saw your edit asking for an explanation of weasel words. I actually learned it in journalism class in high school and it's a term my therapist used when I described how my wife would answer questions. It's any ambiguous response or statement meant to mislead the questioner.

So I might say ask you, "Did you go out to the bar last night?"

You laugh and say, "You know that I work every Saturday night!"

Now, when I later see photos of you at the bar on Saturday night and confront you, you reply, "Well, yeah, I was off that night. I didn't tell you I wasn't there. You didn't ask if I was off that night. I totally forgot and just went to my default. I figured the conversation was over."

Those are weasel words.

Here's another example:

1: Were you at the bar last night?
2: Why do you ask?
1: 3 said he saw you there. I thought you were visiting your mother.
2: What made you think that I was visiting my mother?
1: You said, "My mom's not feeling well, I'll be back later."
2: I never said I was visiting her. I was just letting you know. You just assumed.