Waddafak is the "word" you would use if somebody isn't making any sence, or being a complete goof canoe. I dont wanna know what the literal fucking vagina balls that you would use this "word" in. Probably in response of the most fucked updisgusting thing a friend+ might say.
"I will shove an entire gaping hairy yellow moon-sparkling cheese filled slimey constipated squirrel penis in your throat."
A trip to a grocery store, convenience store, or gas station for the sole purpose of buying an excessive amount of junk food and sugary drinks, usually with friends. A chud run often happens late at night and ends with everyone involved hating themselves afterwards.