Having put my thinking cap on, I've come up with this hotch-potch of words and phrases that were familiar to me in my in 1950's/1960s childhood. I imagine a good number would be met with blank stares of incomprehension if slipped into conversation with anyone not of a similar vintage.
skedaddle - leave a place quickly
vamoose - leave a place hurriedly
moonlight flit, do a bunk - leave rented accomodation without paying
baksheesh - money given as a tip
buckshee - free, without a charge
smithereens - as in smash to smithereens (pieces)
shemozzle - noisy confusion, hullabaloo
schnozzle - nose
bonce - head
give someone a fourpenny one - hit with the fist, maybe with the aid of a knuckleduster
skewwhiff - not straight
spend a penny - euphemism for going to the toilet
dekko - a look, as in 'take a dekko'
yakking - talking excessively
battleaxe - a quarrelsome woman
cummerbund - mens broad waistband
muffler - scarf worn around the neck
cloth-ears/cloth-eared - hard of hearing
ragamuffin / urchin - a child in ragged, dirty clothes
jalopy - an old car
play hooky - to truant from school
willy-nilly - like it or not