What is Necky?
1.
to place a rat in a cup (preferably a coffee mug) and then to piss in the cup and watch the rat squirm and drown in your piss.
Steve: holy shit u gotta rat in ur house
Tony: where's tht son of a bitch. im gonna give him the worst necky hes ever imagined.
Steve: want some crack?
See
2.
to french kiss a person
'oi chrissy ya wanting a necky with naomi ?'