The first time I heard the word, "Sevy." I immediately thought, "Severus Snape."

So here's my advice to you.

Ninth grader: Hey there Sevy.

"Look him or her straight in the eye and glare a Severus Snape glare and scowl."

You: I am not Severus Snape.

"Then walk away pretending you have a cloak that's billowing behind you."