Old Dominion Was The Answer To A Jeopardy Question

Old Dominion is a successful and established country duo. They have been nominated for several CMTs and won the ACM for Vocal Group of the Year in 2018! But the moment these two realized they really made it was when they were referred to in a Jeopardy question last night:

I fell asleep during the episode because I apparently I am 103 years old. There is a lot of debate in the comments of what the actual answer (or question) was. I thought it was "What is a baseball hat" but now I am doubting myself. Perhaps I need to know what the category was for context?

Either way, it's super cool to hear the legendary Alex Trebek refer to your band's hit song. So go Old Dominion, you guys are the coolest! But really...if someone could clear up what the answer was I'd really appreciate it.