Monday idiom. Have a blast!

Finally my beloved Pudding we've reached the end of the School year, now we can all enjoy a lovely summer and ...

This awesome expression has a certainly blurry and unknown past which it's not written anywhere. What I can tell you is that this expression has a synonym; Have a ball! and they both mean to have a great time.  

So, see you with more expressions, games and activities when we all get back from a well-deserved holiday!  

Have a blast fellows! 

B.P