I rekon - I reckon is when you say you're not sure, but you're also no

I reckon is when you say you're not sure, but you're also not going to do anything about it.

I reckon I'm gonna get a dog. I don't know. I don't care.

I reckon that chicken is cooked. It might be. Maybe not.

I reckon I'll pass. I might. I might not. Who cares?