Exactly right. Origin: British english. Also "spot on."

To talk too much, about nothing in particular

Dublin slang for someone who is sound

To abruptly hang up the phone on somebody

bang on, used to describe when a man gets an erection and creates a visible bulge in his pants

South London slang 'to fancy a boy/girl'

When we go out Fahy is well bang on, which means, on top, supicious looking etc