Went to town on

exp.

Heard in Offaly

To devote excessive attention or violence to something or someone.

In use

Yer man really went to town on some poor divil outside the chipper last night. The lad's in intensive care now and Yer man's in the pigsty.

Posh English

That gentleman absolutely set upon some unfortunate fellow outside the fried tuber emporium last night. The chap is now in intensive care and his assailant languishes in the constabulary cells.