Usually through texting or IMing, two people are speaking to one another about a certain topic and during the delay on one of the person's responses, the other person puts in something irrelevant to what they are about to answer. When the other person finishes typing the first response, he/she then begin to respond to the irrelevant comment during the time the other person responds to the first answer. Thus continues a spiral of confusion which usually ends in them asking one another what they are talking about and what they are referring to, topic 1 or 2.
Jim: Hey did you see the new Tim Burton movie?
Anna: *Anna is typing...*
Jim: Oh and btw Lauren got a new puppy!
Anna: No I didn't see it yet. Is it good?
Jim: *Jim is typing...*
Anna: OMG a new puppy? What kind!
Jim: It was okay. More shitty music. I miss Danny Elfman's old stuff.
Jim: Its a chihuahua. Like her old one.
Anna:Yeah I miss it.
Jim: Yeah. It was so much more dynamic.
Anna: Wait.. what? Her old dog?
Jim: No, his music.
Anna: Whose music.
Jim: I'm confused..... sigh. I hate double conversations.