Top definition
noun
1. When a man is flirting with a woman. Another man sees that they are flirting and begins flirting with that women, exclusively to the first man. This prevents the first man from getting sex with the woman.
2. A man who is trying to prevent another man from getting sex. He does this by flirting with the girl the original man planned on having sex with.
1. I was real close to getting her in bed, until Johnny walked in and turned it into a real twotblocker.
2. That chick had a thing for me, until the twotblocker started talking to her.
by fushahb20815 May 17, 2009
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