Cillian Hanrahan Share definition Flag A funny and dark guy but will make fun of you for every mistake, no matter who you are he will always be 1 inch taller than you, he is very stupid girl1 "oh is that Cillian Hanrahan?,"girl2 "i bet his dick is small," Cillian Hanrahan by womanslayer696969 August 5, 2021 Get the Cillian Hanrahan mug.