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1.
To run in a room with a bag of Doritos yelling something loud. This causes the guy to leave and the girls to stay with the "peacock blocker."
Madison: "What happened with you, Megan, and Victoria last night?"

Tate: "Nothing at all, Brad ran in and peacock blocked me, so I ended up sleeping on the couch."
von Jerimay Hoohoo 28. Juni 2010
 
2.
A method of cock blocking whereby a male will knowingly suggest another male wear unattractive clothing by telling him the clothing is actually attractive, thereby preventing the "blockee" from attracting females and giving the "blocker" better odds of attracting a mate.
Male #1: "Why is Jimmy wearing an Ed Hardy hat, t-shirt AND jacket all at the same time?"

Male #2: "Because I told him to."

Male #1: "You totally peacock blocked him!"
von wedgestreet 2. Dezember 2009
 
3.
A gay man who prevents a straight man from scoring sexually with a woman.
Man, I can't believe it. I was hanging out with Katie last night, and my gay roommate Derek wanted to come along. We were getting along great, but Derek kept acting like a sad little puppy dog and was pulling the attention away from me. He peacock blocked me!
von fuzzysquirrelnuts2 15. Juli 2010