KNEE-SLAPPER
Meaning of KNEE-SLAPPER in English
ˈ ̷ ̷ ˌ ̷ ̷ ̷ ̷ noun
Etymology: from the phrase slap one's knee (to express mirth)
: an extremely funny joke, line, or story
Webster's New International English Dictionary.
Новый международный словарь английского языка Webster.
2012