What is Mcgillicuddy?
1.
The more common spelling of a very hilarious Irish surname; see
My name is Bumpus McGillicuddy and I am a traveling novelty salesman.
See
2.
A name to tag on to an adjective to show the severity of the aforementioned word.
When your nose won't quit running and your full of mucous,
" I'm Snotty McGillicuddy" or when your friend is in a foul mood,
" Why are you being such a crabby McGillicuddy?"
See