Welcome from me too!
Terry is very well read and has often admitted that he doesn't remember where he got a phrase or a name from (Rincewind being a good example). Chances are he read it somewhere.
Interestingly, I just Googled the phrase and Urban Dictionary says it's a Northern English phrase, while another site says it's Kentish.
Look, you've got it all wrong! You don't NEED to follow ME, You don't NEED to follow ANYBODY! You've got to think for your selves! You're ALL individuals!
Yes! We're all individuals!