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1.
To celebrate the birth of a baby with a drink of alcohol or more usually an excuse for a drinking spree.
Congratulations Bill! How about we go out tonight to wet the baby's head?
Por VAKI5 07 de mayo de 2005
 
2.
The process of celebrating the birth of a baby. Traditionally taking its name from the Christian baptismal rite, during which the head of a baby would be wet with blesed water, the phrase now commonly relates to the consumption of large amounts of alcohol as a celebration of the new arrival.

The actual process of wetting the baby's head is far more fun before the baby is born.
Bloke 1: check out the cans on that barmaid.
Bloke 2: Dude, you're married.
Bloke 1: Yeah, but...
Bloke 2: You're wife just had a kid.
Bloke 1: Yeah, well..
Bloke 2: We're here celebrating, to wet the baby's head.
Bloke 1: True. But she has got really nice cans.
Por Phil Bool 26 de septiembre de 2006
 
3.
To have sex with an extremely pregnant woman.
Person 1: I banged my girl yesterday, she's 38 weeks pregnant!
Person 2: You wet the baby's head, huh?
Por TookLongEnough 23 de mayo de 2012