Lick the back end of me sack!

exp.

Heard in Louth

An emphatic refusal, crudely implying the addressee should lick the rear of one's scrotum.

In use

Will you give me a lift up town?" "Lick the back end of me sack!

Posh English

Would you be so kind as to give me a lift into town? Perform an anatomically improbable act upon my person!