It refers to when someone talks and all you hear is wah wah, wah wah, wah wah. Like when an adult talked to Charlie Brown in the cartoon.
She talks so much I get Charlie Brown syndrome every time we have a conversation. I never hear a word she says.
Wake up needing to take a shit, then immediately have a Charlie horse in the back of your leg.
I had such a bad charlie brown this morning, I looked like the walking dead trying to get to the toilet.
The act of inserting a finger (or toe) into your partner's rectum without warning, often as good-natured retribution for minor arguments
"My wife wouldn't let me turn off that terrible TV show the kids were watching, so I gave her a Charlie Brown later as payback."
Slang for fecal matter often when referring to taking a larger one
Guys, I really need to take a Charlie Brown or else I'll shit my pants!
The act of pouring an espresso shot into someone's ass and slurping it back out.
Be careful when Susan says she wants a Charlie Brown, she makes those espresso shots extra hot.
If you have a poop that is nutty and smells slightly like peanuts
Guy1: Dude I shit my self
Guy2: What type?
Guy1: The old fashion charlie brown