'arry potta Share definition Flag Slang version of Harry Potter, usually used to diss someone who looks like him (Harryus Potterus). Dickhead #1- Look! 'Arry Potta! AAAAHAA!!!! 'Arry Potta- Leave me alone! (Cries) 'arry potta by Yusuf Cocks November 29, 2004 Get the 'arry potta mug.