Best definition
Combination of yacking and nagging. When your girlfriend/wife is killing you verbally for hours and won’t shut up or

let you sleep because of something you did.

Man, my wife has been yagging me all day and night for forgetting our anniversary. I didn’t get any sleep last night.
yagging: define #2
a closet guy’s online confessions about his sexuality to other gay people without disclosing his identity.
whats the talk of the town?

Havent you heard this closet yagging his pants off!