For those of you uneducated folk; Itami means 'pain' in japanese.
Also, for fear of being left out; Itami is a guy who never misses an opportunity to make fun of people who feel they are so high above everyone else, from koto to itz I'm sure you've seen many more on urbandictionary
'Ahh. Itami! Itami! *Points to his elbow*'
'Okay, let me go get a band-aid.'
Itami is the biggest asshole, ever. *Mocking tone* I wish I could be as koto -- I mean -- as Itami as that.