Definition of wet the baby's head in English:
British informal Celebrate a baby’s birth with a drink, typically an alcoholic one.
- No, not that, I did that with Muriel, John and Gus last night - you know, went for a drink to celebrate wetting the baby's head.
- We definitely wet the baby's head afterwards, then the team came back to our house.
- Many of you may want to help her wet the baby's head at the plush casual eatery next to Bar 38, off Coney Street, which is opening this weekend.