lipogram - A writing composed of words not having a certain letter or letters; -- [as in the Odyssey of Tryphiodorus there was no A in the first book, no B in the second, and so on.]

so now...

WttyGrrl: omit opium so not difficult
timmy: wow...
timmy: though it could work
WttyGrrl: but writing is going to suck
WttyGrrl: four so far
WttyGrrl: not bad
timmy: uh huh...you should try to do it for fun though
timmy: oh, my wttygrrl, you must try...
WttyGrrl: i must
WttyGrrl: i will
WttyGrrl: you will with difficulty?
WttyGrrl: duo? or trio?
WttyGrrl: but who?
timmy: you could do it if you think with your mind
WttyGrrl: you too...or both
timmy: without lifting your pinky
WttyGrrl: lol..shit
timmy: durn tootin'