jazzers

Old Lancashire colloquialism meaning stairs

"Can you nip up the jazzers"
"Amy is up the jazzers"

slonks

Clothes that you wear when relaxing (not pjs or clothes you normally wear out)
Comes from slonking
Clothes inlude joggers or relatively loose fitting, comfy clothing

"I've got my slonks on"
"Gonna go put some slonky gear on"