Lil Yachty’s new album may be titled “Teenage Emotions,” but the rapper has, at best, an elementary understanding of musical instruments.

In a video for the lyrics website Genius, the 19-year-old rapper explained the meaning behind “Peek a Boo,” his hit single featuring the rap group Migos.

The song features a number of confusing lyrics, but no lyric has been more difficult for listeners to understand than, “She blow that d-k like a cello.”

“I guess for a second, I thought a cello was a woodwind instrument and it is not,” Yachty said.

The source of Yachty’s befuddlement goes back to the popular animated series “SpongeBob Squarepants.”

“I thought Squidward played the cello,” Yachty said.

For the record, Squidward plays another woodwind instrument: the clarinet.

Lil Yachty dropped “Teenage Emotions” on Friday and will play a few dates in North America and Australia before embarking on The Teenage Tour in August.