this phrase means 'something like this/that'. It's just a little more intellectual-sounding than 'something like that'. = similar to something else
I think you'd be good as a fitness instructor or something along those lines.
He said "Never let anyone tell you what you can do or can't do" or something along those lines.
I was thinking about a shark or something along those lines.
We usually start with general questions along the lines of, 'How do you feel?'
They're trying to organise a trip to the beach or something along those lines.