When a man pleasures himself though masturbation.
This is a prime example of how funny people can create a saying, everyone thank the hilarious E4 narrator for this word invention.
E4 man: 'And next on channel 4 it's 'waking the baby mammoth'. Which sounds like a metaphor for something but isn't.'
Rose & Al: UNTIL NOW!!
Waking the baby is what Mom and Dad have so much energy that they wake the baby up for the feeding not the other way around
I feel so good and energized and ready to Take On The World this morning I was all about waking the baby this morning for her feeding