Speech Impediments?

I think I've got this worked out, but could anyone confirm my
translation of the Hull speech impediment?

"dob them in to their gaffers"

I think this means that anyone stealing from, or defrauding their
employers should be grassed up. Is that correct?

Does this apply to employees of BP Chemicals?

"dead drop", "live drop".

I assume this refers to grocery deliveries, but does anyone have a clue
what these phrases actually mean?

"our lass".

Does this refer to the 16 stone sweaty wife of a Hull resident?

"a session up Sprout Hill".

Is this a reference to consensual anal sex?

I did think about asking a teacher, but the only ones I know of can't spell.

--
Dave - Cyclists VOR. "Many people barely recognise the bicycle as a
legitimate mode of transport; it is either a toy for children or a
vehicle fit only for the poor and/or strange," Dave Horton - Lancaster
University