A barrel/bundle of laughs British informal Compound
To be funny, hilarious, and pleasant
John is a hilarious guy with many jokes. He's actually a bundle of laughs.
When I'm around with Linda, I always have so much fun. She's a barrel of laughs.
In this context, the expression started life as 'a barrel of fun' -' barrel' just means 'a lot of'. In documents found in the USA, it is first quoted. An early example is this entry in the 1890 edition of Dialect Notes, under the heading 'A Word List from Montana'.
White lie
Ken: Yesterday I lost the watch that my girlfriend presented to me. Should I tell her this thing?
Lily: Certainly Not! Your girlfriend will be angry with you. Children and fools tell the truth.