I was thinking about going stag (гет)

“So who’s the Slytherin prefect taking to the Yule Ball?”
Levi glanced up from his potions textbook. He was sprawled on the couch in the common room and was doing an admirable job of studying despite the chatter around him. When conversation had turned to that damned dance, he’d thought about heading straight for his room. He should have.
Reiner was smirking at him, not about to let the question go unanswered.
Levi went back to his book. “I was thinking about going stag.”