The word 'belm'

I was a nipper when Blue Peter featured Joey, and believe me the 'mong' hand in front of chin thing started the very next day at school, only we used to shout 'Joeyyyyyy' not 'Belm'. Belm is a recent thing I reckon, it wasn't said at the time

we were OG 'Joeyyyyyyy' all the way

Belm simply describes the sticking your tongue behind and beneath your lower lip, it has nothing to do with Joey, Jeez has been misled by urban dictionary