"If you date or marry me -- which he did -- you gotta kinda marry my brothers, as well, and we call him Serial Killer. I'll be like, 'Hey sugar' or some weird stuff, but when we're talking about him, it's 'Serial Killer' because he looks crazy in a lot of pictures," Trainor said on "A Little Late with Lilly Singh", reports femalefirst.co.uk.
"But also he does suspicious things that we're like, 'Are you a serial killer and we just haven't figured it out yet?' He'll go to the movies by himself -- not just one movie, but four back-to-back. Like solo dolo, by himself.
"And he never has sauce on anything, not even salad! Just dry! I begged him, 'Just try this sauce, is it the wrong sauce?' and he's like, 'I like the grass taste' and I was like, 'You're crazy!' Meanwhile, I'm like four dips, each one."
The 25-year-old singer said she is the "Spy Kids" actor's "number one fan" and thinks her 27-year-old spouse is the nicest person she's ever met.
"I am his number one fan. He's the most supportive human being ever and the nicest guy in the world. Like, you won't believe how nice he is," she said.