[buhst-uhp] 
| 1. | a separation or dissolution, as of a marriage or a close friendship. |
| 2. | a large party, esp. a noisy one. |
| 3. | Chiefly British. a quarrel; disturbance; punch-up. |
| bust-up | |
noun | |
| a serious quarrel (especially one that ends a friendship) |