To have a blast (verb) The normal definition of the word blast refers to a big explosion and it’s a phrase that we could often see or hear in the news for example Two men have been seriously injured and taken to hospital from a suspected bomb blast. But if you use this among your friends, it’s a lot more positive and means that something is great or you had an amazing and fun time.
Example 1)
“How was the Jack Johnson concert?”
“It was awesome. Everyone had a blast.”
“Even John?”
“Yeah even John. He was even dancing!”
“Wow, it must’ve been good!”
Example 2)
“Thanks for inviting me to your party last night, I had a blast.”
“Thanks for coming and I’m glad you enjoyed it.”