“Muffin Top” Is Official
You know about “muffin tops” right? You don’t? You should since the term is now part of the English language. Looking up the definition, you’d find something like this:
the protuberance of fat above the waistband of a tight pair of trousers
Go ahead, use it at work to practice your English mastery. While at it, feel free to use “OMG,” “LOL,” and “TMI.” These are all official as well. Don’t you just “heart” it?