Lush

v.

Heard in Galway, Mayo, Longford and Sligo

To take a hearty gulp or drink from a shared bottle. In the sense of 'proper'.

In use

Can I have a lush of your buckie before the Guards come snoopin' roun'?

Posh English

Might I partake in a sip of your tonic wine before the constabulary arrive to investigate?

Same phrase, other counties