Using twitter to not tweet original thought, but to re-tweet someone else's original thought. Usually involves one individual re-tweeting many others posts.
I wish he would stop just re-tweeting everything he sees, it's just total twit-spam!
A condition of aging years which cause dad jokes to be more frequent and the quality of the dad joke to rapidly decline.
John has a particularly bad case of dadjokeitus.. he can't go 5 mins without telling an awful dad joke.