Definition: To become excited or angry and express one's emotions loudly and forcefully.
Use case: You can use "go off" when talking about someone who suddenly becomes angry or emotional and starts yelling or causing a scene. For example, "When he found out he didn't get the job, he really went off and started yelling at the interviewer." It can also be used to describe a situation where something unexpectedly becomes chaotic or out of control, such as "The party really went off when the police showed up."
• When he heard the news, he completely went off and started throwing things around the room.
• The alarm clock went off, but I hit snooze and went back to sleep.
• The party was so wild that it went off until the early hours of the morning.
• I hope the fireworks don't go off too early, or we'll miss the grand finale.
• I can't wait for the weekend to go off and have some fun with my friends.
• The microwave went off, letting me know that my popcorn was ready.