The Spanish word 'chanchada', meaning 'dirty deed' or 'piggish act', has an interesting etymology that starts with the Latin word 'sanctius' meaning 'sanctified'. Through a peculiar semantic shift, this evolved into the Spanish word 'sancho' meaning 'pig', which then transformed into 'chancho' (also meaning 'pig'). The word 'chanchada' was formed by combining 'chancho' with the Spanish suffix '-ada', which typically indicates an action or result. Thus, 'chanchada' literally means something like 'pig-like action' or 'something a pig would do', which evolved to refer to any dirty or unethical deed.

A simpler and more common related Spanish word is 'chancho', which simply means 'pig'. This is a more basic and concrete term that's commonly used in Latin American Spanish as an alternative to 'cerdo'. While 'chancho' refers to the actual animal, its derivative 'chanchada' took on a more figurative meaning to describe actions that are considered dirty or unethical, drawing from the association of pigs with uncleanliness.

While there aren't any commonly used English words directly related to 'chanchada', it's interesting to note that the original Latin root 'sanctius' is related to English words like 'saint', 'sanctify', and 'sanctuary'. It's a fascinating example of how word meanings can drastically change over time - from something holy and sacred in Latin, to a word for 'pig' in Spanish, and finally to a term for an unethical action!