"Seinfeld" has made a significant impact on pop culture. It none more apparent than their coining of the term muffin top being added to the Oxford English Dictionary. Of course the "Seinfeld" definition of muffin top is not the only definition.
Other words like OMG (oh my God), wassup, and LOL (laugh out loud) are among the many new words added to the Oxford English Dictionary.
They added such words like LOL and OMG because the English language is evolving.
You can see the full updated list here. The Globe and Mail linked to the list in their article which you can see here.