Cheeser

n.

A skimming of the fingers in a whipping motion over an unsuspecting friend's arse.

In use

Yeeeaaaoooowwww!!! Ye feckin cuncha, whatcha give me a cheeser for? Now I'm gonna hafta bayte de feckin' head offa ye!

Let Lawrence Muck translate it to posh English for you
Lawrence Muck

Greetings, from one gentleman to another. Would you like me to translate 'Cheeser' in use for you?

Yeeow! You dreadful scoundrel, whatever did you whip my posterior for? Now I shall be obliged to thrash you soundly!