onomatopiea for a skateboarding bail, but can also be called on someone when they fuck up or do something funny. May be necessary to alter the starting letter for extreme variations such as poonx, and even stoonx, but the standard is goonx. Said in a kind of stone plunking into water low to high way. The result of a goonx is often a goonx egg.
Barry hangs up on the manny edge, falling 5 ft into the concrete flatbottom simultaneously shattering arm and shoulder into millions of razor bone fragments.