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.
Another common problem is a humming noise when the toilet is flushed. This can be caused due to a worn valve diaphragm washer, which is a relatively easy repair. All you have to do is replace the washer. Always remember to turn off the water supply first.