As a noun yacker is
(informal) one who talks at length.
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Not English
Wikidiffcom has no English definition. It may be misspelled. yacker
English
Noun
(
en noun)
(informal) One who talks at length.
* 1961 , Electronics world: Volume 65
- Watch Those Lengthy Conversations: Stick to the 5-minute rule. How many times have you heard yackers say, "Well, I guess we"ve used up our five" when they've been talking for an hour.