1. slang Chatty; inclined to talk. My barber was really yakky when I went to get my haircut, but I was so tired that I really didn't feel like talking. My toddler has become so yakky now that she can express herself better.
2. slang Nauseated or queasy; inclined or about to vomit. I was pretty yakky during the first trimester of my pregnancy, but the nausea seemed to vanish after that. That roller coaster left everyone feeling yakky afterward.
mod. talkative. He’s a yakky old man, but I like him.