The act of removing someone from your conversations and/or life by not updating them when you change your email or other social networking contact information. Also accomplished by defriending them on social networking sites.
Example:
Guy 1: Do your emails keep getting returned when you email Stacie?
Guy 2: Man, I think you got talkblocked.
by thundersnow December 8, 2010
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When having a talk about deep matters and you don't want others to hear and abruptly someone comes to hear what your conversation is about.
1. James and Ryan were having a conversation about girls in their class and Sally came and totally talkblocked them forcing them to change the conversation and continue elsewhere.

2. Chris and Peter were chilling in their room talking about whether or not they would get baked but Peter's mom burst open the door leaving them to talk about other matters. She was a huge talkblock!
by BaAAmUrFACE December 9, 2011
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Someone who interrupts you when you're talking to someone of the opposite gender whom you are interested in pursuing relationship wise and is not necessarily just trying to get in to her pants.
Their interruption usually ends the conversation you and the person of the opposite gender were having.
Tim: Yeah, the movie was pretty great. What's your take on it?
Jill: I thought it was good too. I'd watch it again.
Tim: That's good. A movie for home, then. So, I was wondering if you wanted to do something tomorrow?
Jill: Oh! I'd --
Steve: Hey you guys, what did you think of the movie?
Jill: Hey Steve. Tim and I were just talking about it, we both thought it was good.
Steve: That's cool. Well, I'm going to go get some coffee.
Jill: What were we talking about?
Tim: Oh, nothing.

Later-
Tim: Man, Steve is such a talkblocker.
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when you are tring to have a conversation with one of your friends and you dont want anyone else to hear, but instead someone keeps trying to join it and keeps annoying you. similar concept to cockblocking.
i was trying to talk to James bout women while we were walking down the hill, but instead some lousy dude decided talkblocking us was a great idea
by BEAST MODE JONNY MAC December 1, 2010
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