I get heavy in it
You're so into something it's like it's in your blood and you can't live without it.
He got heavy in it with that girl. He started skipping lunch to talk to her and even texted her in the bathroom.
She got heavy in it with that new song. She sang it in the shower, on the bus, and even in math class.
I got heavy in it with my new sneakers. I wore them to school and even wore them to sleep.