1.) To interfere with someone who is getting acquainted with, conversing with, or hooking up with a member of the opposite sex

2.) A motor vehicle maneuver, usually done by insecure twenty-something males (who think that everybody wants to race them) and other ignorant people, designed to prevent someone from changing lanes in traffic
1.) At the club, Sal was was about to get Lisa's phone number, when Nathan came up cock-blocked him by asking him if he found a job yet. He made it even worse when he reminded Sal that they had to hurry up and catch the last bus home. Lisa rolled her eyes and walked away.

2.) I realized that my exit was coming up so I began to change lanes, but that ricer cock-blocked me

3.) The traffic on the highway was hell, mostly because of that soccer mom driving the minivan in the far left lane, pacing and matching speeds with the semi in the middle lane. She cock-blocked us all.
by TheGrandInquisitor January 25, 2005
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Someone who uses different strategies to keep others from having sex
1. Courtney announces to others that a guy has herpes so even though eveyone gets a good laugh, no one will touch him.
2. Trashley: "Courtney is a natural-born cock-block because she falls asleep in the room everytime I want to bring my boyfriend in there!"
by maddox08 September 27, 2005
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Cock block a guy messing things up for another guy with a girl because he's likes her
My so called friend lee cock blocked me the other day. he really messed things up with Emma just because he likes her too
by 35cat27 November 19, 2013
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Blocking a Male Chicken from reaching it's destination, resulting in the call "Cock Block!"
by rdpunk February 6, 2011
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When your urban Dictionary word gets denied even though it’s “pure gold
They totally Cock Blocked! My Word was amazing!
by XxxxxxUr mom lolxxxx February 19, 2019
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Verb: When a group of guys are simultaneously hitting on a girl and another guy enters in and simultaneously manages to cock block the entire group.
Marlon, Ash, and Baby J were all trying to get with that cute blonde at the bar when Shahty walked up and stole their thunder. He was such a cocks block.
by AshDusky January 31, 2011
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When a guy moves in on a girl that another man has began courting. Usually at a party/club/bar while the other man goes for a drink or to the bathroom but can also apply to any situation where a man has expressed interest in a girl and another man moves in without regard/respect. It is a sign of grievious disrespect and may result in shunning from the male group or a serious beating/pounding/rolling or other retribution. (also Cock blocker and cock blocking)
"I was talking to this girl and my buddy sat down on the other side of her and kept butting into our conversation trying to flirt with her, I'm gonna beat that cock blocker down!"
by Rob Batavia February 27, 2003
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