a barrel of laughs
US /ə ˈbærəl əv læfs/
UK /ə ˈbærəl əv læfs/

1.
someone or something that is very amusing or entertaining
:
•
My uncle is always a barrel of laughs at family gatherings.
•
The comedy show was a barrel of laughs from start to finish.
2.
used ironically to describe someone or something that is not amusing at all, but rather boring or annoying
:
•
Working overtime on a Saturday is just a barrel of laughs, isn't it?
•
His lecture on ancient pottery was hardly a barrel of laughs.