Piddely means: It can smell like piss and be small, insignificant, or unimportant. It is a complete waste of time especially for someone who regards themselves as extremely important. This is a result of the fact that to piddle means to urinate. The assumption that piddle can only be used to describe small amounts of urine is that one wouldn’t likely have the time or the patience to clean it up, think dogs, etc. (in Community Dictionary, added by Kerasine)