keen on. : very enthusiastic or excited about wasn't keen on going.

Is it correct to say keen on?

Yes, but it's a correct one. If a man in North America used “keen on” in the way foreign ESL textbooks teach it, he'd sound like a funny character from a 1930s film. It's seldom used, except in negative sentences, when explaining that someone has an aversion to doing something.

Would you be keen on meaning?

If you are keen on something, you like it a lot and are very enthusiastic about it. ... You use keen to indicate that someone has a lot of enthusiasm for a particular activity and spends a lot of time doing it.