I have asked one of my Manager, how is your health(As he was sick).
He replied almost perpendicular.
So what he wanted to say actually I didn't get. Can anyone tell meaning of this phrase? Thank you.
It is a joke. If you are healthy then you can stand upright and perpendicular to the ground. So being "perpendicular" means (in this context) being in good health. But this is a deliberately odd way to say it. The idea of measuring health as an angle is quite ridiculous.
So this is a light-hearted way of saying "I'm nearly fully recovered, thank you", but with some office humour.
It is not a common or standard expression, and can only be understood in context.