Top Definition
When a jealous girl goes into a violent rant attempting to dissuade other females from flirting with, or even talking to a certain guy. This very contagious fever is usually started by clingy overweight insecure females who are friends of the guy, or of the girl.
"WOW! Carrie won't stop yelling at the girls i'm talking to. It looks like she's came down with a case of the cockblock fever"

"I tried talking to that cute girl over there before that large girl started yelling me and telling me to get off of her friend. That hippo has a case of the cockblock fever.
by Nstarr April 05, 2010

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