The phrase "tinker's cusses" is an old fashioned way of swearing that dates back to the 19th century. It refers to a person who repairs metalware, such as pots and pans, and is known for their colorful language. Finding synonyms for this phrase can be tricky, as it is quite obscure. However, some similar expressions might include "curses," "oaths," or "expletives." Other alternatives might include "profanities," "swear words," or "vulgarities." As with any exclamation, it's always important to be mindful of the context and to use language that is appropriate and respectful to those around us.