noun. Like, there's a chocolate cake, but then whoa! It's full of poo.
Real citation: "Today Was very very good, though not without its bittersweetitude (Dang it Adrienne, now you've got me doing it.) Class was very good (got to have Linear Algebra outside in the beautiful (though a tad toasty) weather, which made it bearable."
(April 13, 2002, http://kilgoretrout.diaryland.com/darkcherry.html)
Made-up citation: "I don't think my dog lives in a world with much bittersweetitude. He's either barking mad at hallway interlopers or doing the dance of joy about his fluffball friends (or treats). Not much grey area."