These are called vocables, a form of non-lexical utterance - that is, wordlike sounds that aren’t strictly words, have flexible meaning depending on context, and reflect the speakers emotional reaction to the context rather than stating something specific. They also include uh-oh! (that’s not good!), uh-huh and mm-hmm (yes), uhn-uhn (no), huh? (what?), huh… (oh, I see…), hmmn… (I wonder… / maybe…), awww! (that’s cute!), aww… (darn it…), um? (excuse me; that doesn’t seem right?), ugh and guh (expressions of alarm, disgust, or sympathy toward somebody else’s displeasure or distress), etc.

I’m just gonna put it out there that if someone’s freaking about something small, they’re really freaking out about something big that they’re trying to deal with, or something long term that’s been building up, and that little thing is the straw that broke the camel’s back.

Why I don’t think it’s funny when men make jokes about that their lives are over once they’re married: