A bachelor party (Unite States, South Africa), also known as a stag party or stag night or stag do (UK, Ireland, Canada and New Zealand), bull's party (South Africa) or buck's party, or buck's night (Australia) is a party held for a bachelor shortly before he enters marriage, to make the most of his final opportunity to engage in activities a new wife might not approve of, or merely to spend time bonding with his male friends (often in his wedding party afterwards).