Big Sean Calls Girlfriend Ariana Grande ''the Coolest,'' Says He Isn't ''Spiteful'' When It Comes to Ex Naya Rivera

What are the four words that best describe the way Big Sean feels about his girlfriend Ariana Grande?

"She's supercool--the coolest," the 26-year-old rapper said in a recent interview with Billboard magazine.

The hip-hop star said he met the 21-year-old singer at the 2012 Wango Tango concert when she rapped his own lyrics for him. "Ever since, we've been friendly, hung out once in a while, and it just evolved," he added. "I respect her--so I don't think I should talk about it."

Sean also dished on his song "I Don't Give a F--k," which most fans think is about his ex Naya Rivera. "I had that song a year ago, when I was in that relationship, but obviously everyone thinks it's about her," he said. "I write about what I go through--not fake s--t. That's my responsibility."

"I want to write about what really happens, but I'm not a spiteful person," he added. "I've answered so many questions about it, people are going to think what they want no matter what I say."

Speaking of the women in his life, Sean also opened up about the loss of his grandmother who passed away in December of a stroke. "In a selfish way, it was hard to say goodbye," Sean admitted, adding, "but when I stepped back, I was happy she was free of the wheelchair and didn't have to go through that."