Yeah dude, totally.

Used as a response when someone expects you to care or get it, but you really dont.
Or when someone blurts out something akward/embarrassing but they dont realize it.

A: i miss my girlfriend
B: yeah dude, totally.

/

A: My spotify wrapped came in! My top three was TV girl, Mommy sleeping aid ASMR and beabadobee!
B: yeah dude, totally.