Pretty straightforward. That moral your friends repeat over and over again when they tell you that you shouldn't have slept with that girl last night 'cause they knew she'd take shit too seriously.
Clarence: shit bruv that Jessica chick is all over me she won't get off of me man she's tagging me in all this relationship post bullshit, saving pics of me, telling her friends, texting me 24/7... what do I do?
Bob: bro idk lmao you bloody fuckin' had sex with her not me. you know what they say fam don't stick your dick in crazy.
A common saying and good advice for men thinking about having sex with a crazy bitch.
Usually a woman that:
Never shuts the hell up, has an annoying high pitched voice and laugh, gets way too overly attached, has shaved/short hair, stares into your sole, has bigger muscles than you, believes there's more than two genders and calls herself a feminist.