Over the past couple weeks Jasper has had this really weird fishy/sour smell coming from his butt. I thought maybe it was something he ate but we cut out all table scraps and its still there.
Also, we just gave him a bath tonight and the smell's still there so I doubt its anything he may have sat in

Anyone have any idea what this could be? and if it's serious (should i make a vet visit)?

Most likely his anal glands are full, and may be plugged. You can express them yourself if you're not squeamish, but you might want to make a trip to the vet and make sure he doesn't have an infection in one or both of them.

I thought he might be too young for that as he's only 7 month, and I also thought a big sign of glands was dragging his butt across the floor but jasper doesn't do that... I guess it doesn't matter?

Welcome to the stinky Butt club. Age doesn't matter. My pup is 14 weeks and had to get his expressed at 13 weeks. He wasn't scooting on the carpet the smell was there. So off to vet we went and he was quite full. Is your dog having soft stool?

Sort of, but not full blown diahrea or anything.