The book says most kids know at least one obscene word by the time they're two years old. The work is called “A Brief History of Swearing” and it also finds that people who speak English toss in a curse word once in about every 140 words spoken.
That means curse words are as common in our language as first person plural pronouns like “our”, “us”, and “we.”
The author of the work is Mellissa Mohr, a language professor from Stanford University. She blames the cussing kids epidemic on the adults in their life.
Mohr’s theory is the kids are only parroting what they hear from their parents, TV, and others around them.
Other findings in the book are:
Cursing usually begins when a child is just three to four years old.
Middle class families have less of a potty mouth than those who are better off.
On the positive side Mohr says a well placed cuss word can be helpful. Like when the hammer slips and hits your finger. A loudly screamed profanity is said to help relieve pain.
Cursing can also us bond with co-workers or other in a particular predicament.