Pendejo is a vulgar Spanish-language term of abuse. To call a person a pendejo is essentially to call him stupid, although it also carries implications of wilful stubbornness and rank ineptitude.
A toilet may run periodically due to a problem with the flapper, the flapper seal, the flapper chain or a high float.
The most common cause of a malfunctioning toilet is a simple clog. Many times inappropriate items are flushed down the toilet. Often a plumber has opened up a clogged toilet only to find a child's toy blocking the pipes. If you cannot clear it with a household plunger though, the clog may be too far down the sewer line and require a professional to snake out the line.