Have a high old time
Definition 1 of 1
Pro Tip 1/3Colloquial Usage
This phrase is informal and best for casual conversations with friends, not formal situations. 
They had a high old time at the reunion.
Pro Tip 2/3Exaggeration
Often used to exaggerate how much fun was had, accentuating positive feelings. 
I had a high old time at the concert - it was unforgettable!
Pro Tip 3/3Intensity
The phrase implies an intense level of enjoyment, more than just having a good time. 
After winning the game, we had a high old time celebrating.