Ing Disease is what happens when too many present-participle verbs are used at once. This has a tendency to make odd things happen, as the character attempts to perform all the actions described simultaneously. The example given by the Turkey City Lexicon runs thus: "'Putting his key in the door, he leapt up the stairs and got his revolver out of the bureau.' Alas, our hero couldn’t do this even if his arms were forty feet long."
As Disease[]
A related affliction may be As Disease, wherein the word "as" is used like a catch-all adverb and conjunction, causing symptoms similar to those described above.
A word to the wise: to avoid ambiguity, remember that "as" in the sense of "because" or "therefore" or "since" is not standard, and overusing it may cause your readers massive headaches as they try to figure out how your character is doing all of those things at once.
For an informative discussion of why "as" should be avoided and how to most effectively form sentences in fiction writing, see Sentence Structure for FICTION by *OokamiKasumi.