The sound a sick shot in lax, soccer, etc. makes when it strikes the net. Usually only applies for top corner or top "ched" shots. The noise is most evident when the seam is hit on lax nets.
A person in possession of both an abnormally prominent chin and forehead (CHin + forehEAD=Ched) The individual typically resembles an extraterrestrial life form, especially when combined with almond shaped eyes and/or wrap around sunglasses. The Ched's natural habitat is in the McDonald's kitchen, where he works to support a drug habit and/or pregnant underage girlfriend.
Mike: Dude, you could project a movie on that guy's forehead
Steve: Yeah his chin is shaped like an ice creamcone Bob: Guys, he's a ched.