Bullocks piss

n.

Heard in Dublin

Urinating in an uncontrolled, spraying manner.

In use

When someone is pissing and its spraying, jaysus your all over the shop like a bullocks piss

Posh English

When a gentleman produces an uncontrolled and spraying stream of urine, good heavens, you are in a state of utter disarray, all over the establishment like an animal's bladder.