the vacuum

In player parlance, it's a pushy technique used in making conversation with women where you ask an open-ended question and stubbornly wait for an answer. You don't say anything until she does, no matter what. You don't fidget, you don't laugh, you don't look apologetic or at all uncomfortable. Eventually, she will get uncomfortable with the vacuum, and fill it by answering your question, getting herself involved in the conversation.