Verb. The act of vomiting in a pub in front of everybody, especially when one of the onlookers is an attractive barmaid who then has to mop up after you.
I was out last night and ended up doing a keates in O'Neills.
Another word for Wanker. To Keates is basically to Wank.
Johns gone for a Keates
"That boys a Keates"