Classical New Zealand slang that refers to intercourse with a vagina.
The term is used more often in regional parts of the country.
"Sup Girl, did he smash your pipi?"
- Casual conversation between two friends.
"Aww boys. I'm feeling lucky tonight. Gonna smash the pipi!"
"Nah, whatever, bro. You couldn't smash shit"
- One friend boasting about his near term prospects while another friend reminds him of reality