The phrase yelled excitedly by our classmate Ivan as he strolled, er... proudly... through the changing room after PE, his full erection sticking up and outwards inside his underpants but mercifully not popping out over the top.
We were about 15 at the time, so presumably it wasn't his first ever stiffy. It was a testament to his immense popularity in our year that getting a stonk-on in a changing room full of half-naked lads, announcing the fact, and then showing it to all and sundry, didn't get him tormented, physically or verbally, to death in the remaining 3 years of high school.