These are probably all noted already. I wouldn't describe them as 'lost' scousisms, but then again i haven't lived there for 20 years, so dunno...but after i moved southerners didn't understand these words and phrases.
A backie - to ride on the back of someone's bicycle
A leggy - as above
Meff - a scruffy, unkempt or unfashionable person
Tatty 'ed - messy or bedraggled hair
Boss - great, terrific, i like it
Give em down the banks - to criticise harshly
Kipper - face
Smeg 'ed- an idiot
Come 'ed - come on
Jangle - idle talk, gossip
Jigger - an alley way
Antwacky - old, ancient, out of date
Bizzy - policeman
Quilt - an idiot or weakling
Slummie - loose change
Coppers - loose change, pennies and two p's
Minty - dirty, unfashionable
Gooseable - describing someone you find sexually attractive
Til dick docked - waiting a long time
Keep dixie - keep a look out
Casey - a leather football
Dolled up (to the nines) - not sure if this is scouse, but is when a woman is wearing her finest or even overdressed
Fiddlin' da lecky - tampering with the electric meter to avoid payment
Doggy wallace - a snitch or grass (one of my grandmother's sayings that one)