Why do people say "Chillin like a Villain"

I know it's because it rhymes but lots of things rhyme, it just doesn't make any sense.

I don't know any villains personally so admittedly I'm generalising based on their media appearances, but they don't see to be chilling at all.

They always plotting, scheming or undermining. It sounds stressful and exhausting.

Don't get me wrong I'm sure they love what they do but they are not chilling in any capacity, quite the opposite.