An informal set phrase expressing a lot of gratitude to someone for something. A: "Your mom and I got you a new laptop for college." B: "Oh wow, thanks loads, Dad!" A: "Here's that book you asked for, Tom." B: "Thanks loads, Sarah."
Inf. Thanks a lot. Mary: Here, you can have these. And take these too. Sally: Thanks loads. John: Wow! You look great! Sally: Thanks loads. I try.