That's a hoot.
That's a hoot.
That's a hoot" refers to something extremely amusing or funny, just like the loud, unexpected sound of a hoot. It’s used when something makes you laugh heartily or when you’re having a great time.
That movie was a hoot, I couldn't stop laughing!
The speaker found the movie to be very funny and entertaining.
You guys, last night was such a hoot at the karaoke bar!
The speaker describes last night at the karaoke bar as very fun and entertaining.
Oh man, telling jokes with you is always a hoot, I'm in stitches every time.
The speaker always finds joking with their friend very funny and entertaining, making them laugh a lot.