A long period of time in which no one speaks because something has been said that either 1.) ended the conversation 2.) something odd, morbid, surprising, ect. has been said 3.) inturupted the converation resulting in loss of topic. Usually followed by small talk.
1.) My class was having a discussion on the book We're reading, and when the teacher didn't have anything to say, John yelled out, "Awkward Silence...!"
2.) When John told Jake to f*** off, there was a long awkward silence between the two of us.
3.) I was talking to John, and when his friend called him into the other room, their was an awkward silence between my other friend because we didn't know what to talk about.