Back end of the bat mobile

n.

Heard in Limerick

The state of your Brass Eye soon after you eat a really hot curry.

In use

I had a Ring Stinger in the curry house last night, and now I've got a dose of the runs. My arse feels like the back end of the Bat Mobile.

Posh English

I partook of a fiery curry at the Benghazi establishment last night, and now my posterior feels precisely like the rear end of the Batmobile.