: to say words in order to express one's thoughts, feelings, opinions, etc., about (something)
She still talks about your wedding and how perfect it was.
2
: to discuss
We were talking about last night's game.
3
: to discuss the personal lives of (other people) : to gossip
It's rude to talk about people behind their back(s).
4
: to mean—used in the phrase "What are you/they talking about?" or "What is he/she talking about?" to show that one is confused, worried, upset, etc., about something that someone has just said
Not done well? What are you talking about? I did what you told me to do.
5
informal—used to emphasize the size, amount, or extent of something
Talk about having a bad day. I had the worst day ever!