Meh: Yes, this is often spoken while shrugging your shoulders to signify that you don't care about something, or that it doesn't bother you. Hm/Hmm/Hmmmm: Yes, this sound is made with a closed mouth, and can be used to indicate a wide variety of things, including disgust, curiosity, incredulity, surprise, etc. It really depends upon your facial expressions and intonation. Ummm/um: Yes, this sound is typically used to express confusion. You can also use it if you need a moment to think of the right word. Huh?/Eh?: Yes, these words are used to signal to the speaker that you did not understand what they said, or that you couldn't hear them properly and need them to repeat what they just said. Aww!: Yes, this is used to express that you believe something is cute or sweet. It is commonly said at the beginning of an exclamation, such as, "Aww! Your puppy is so adorable!" Oops: Yes, it is used to indicate that you made a mistake. Phew: It is very rarely spoken, and is usually said in a dramatic or ironic way, and often said while making a wiping motion over one's forehead (wiping away imaginary or real sweat) to indicate that something is exhausting. Hmph: It is very rarely spoken, and is usually said in a dramatic or ironic way to express disapproval. Brr: Yes, it is used to indicate that you are cold, and is often said while rubbing one's arms in an effort to warm up. Ouch!: Yes, it is used when you hurt yourself, or when someone says something hurtful to you.