An interjection when two people are talking that helps the non-speaker (person B) remember something they want to say while the speaker (person A) is talking. When person A is done speaking they say "avacado", thus reminding person B that they had something to say.
Person A: "....so the other night we were watching American Idol and Ellen was so..."
Person B: <interjects> "avacado"
Person A: "...good at judging I mean she was like part Simon, part Paula. Avacado."
Person B: The other day I meant to tell you we went to see that movie we were talking about.