Lashin it up

v.

Heard in Dublin

To engage in vigorous sexual intercourse.

In use

So I was in the lane with me fella last weekend and he was lashin it up and the Johnny broke... I hope I don't get knocked up!

Posh English

So I was in the lane with my gentleman friend last weekend and he was applying himself most vigorously when the prophylactic burst. I do hope I do not find myself with child.