pickyak-yak . yak-yak or yakety-yak or yakib-yak {n.}, {slang} Much talk about little things; talking all the time about unimportant things. Tom sat behind two girls on the bus and he got tired of their silly yak-yak. Categories: add yours noun slang time Source: A Dictionary of American Idioms Subscribe to: American IdiomsEnglish Slang Discuss