(adjective) when a person is extremely lucky but does not like it when good things happens to others.
(noun) a person who has exhibits the trait described above
Other Forms:
(noun) yaggot
(verb) yagging, yagged
A: can't believe I finally have time to play <game name>
B: Damn you're lucky, you have time to play A: keep yagging, you just got came back from a week of paid vacation and had all that time to play
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.