Definition from Wiktionary, the free dictionary
vulgarism (plural vulgarisms)
- (grammar) A word or term that is considered offensive or vulgar.
- "Shit" is a vulgarism.
- A spelling, word, or phrase used in common speech that is considered improper or incorrect for formal communication.
- Editors of newspapers allow more vulgarisms to go to print today than they used to.
Related terms 
word or term that is considered offensive or vulgar