A very mild curse word. Even parents who make their kids binge when they just say "shut up" to their brother, sometimes don't mind this word. So, it is often used by those kids to mean any other curse word of their choice.
This word can basically mean any adjective, but in most cases, it will either mean gross, old, and/or ugly (see grody). It can also mean, however, cool or tight.
"Eww I need a new comfortor, mine's all crusty-like."