This was a question haunting a small boy. His parents were at wit's end, as they could not explain it in a simple language the boy could comprehend. Once the family went for a dharshan to Shri Ramana Maharishi. The boy put forward his question to Shri Ramana
" Now I will say "Hmm"
Then only you should start eating. Then again I will say
The boy agreed. He was so excited. Others were watching expectantly. Now the boy was eagerly waiting for the signal by looking at Shri Ramana's face. When he gave the signal "hmm" the boy started eating.
Now Shri Ramana asked him " where was your attention till now? On me or on Dosa?"The boy replied " On both"
Shri Ramana said" Yes.
Like this when you do your daily activities with your attention or thoughts on God in the background, it is known as meditation."
The two signals "hmm" are birth & death.
@ProfMKay