“Whoa! Look at the size of that rock!”
Your friend just got engaged. She shows you her engagement ring, which is really big. You and your friend joke with each other a lot, so you make a funny comment about the ring.
Whoa! Look at the size of that rock!
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Look at the size of that (thing)!
Say this when you see something really big:
Look at the size of those teeth! Man, I wouldn't want to come across one of those out in the wild.
Look at the size of that guy's shoulder muscles! He looks like the Incredible Hulk!
This phrase expresses feelings of surprise and admiration.
Whoa!
"Whoa!" can mean "Wow!". You say this when you're surprised and impressed by something. For example, while you're riding an amusement park ride, you can say:
Whoa! This is crazy!
If your friend demonstrates an amazing talent, you can say:
Whoa! How did you do that?
a rock
In casual English, you can call a diamond a "rock".
This is a slang term. but it's commonly known across most English speakers.