To ejaculate, like a boss.
I was up in the mezzanine this one time, and Samantha walked in, and I projaculated. She was dead impressed.
To projaculate is, simply, to projectile ejaculate. Similar to projectile vomiting but more enjoyable.
'My fish is dead! I was having a slap over my DVD of 'embarrassing bodies' when I projaculated and shot a hole in his tank'.