The act of cutting short your gym workout because of prior commitments afterwards, only to find out that those plans have fallen through.
Eric totally jockblocked me the other day. I left the gym early to go meet him at the bar, but I got text saying he had to cancel as soon as I got there.
by whattheflutka February 3, 2011
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the act of stopping douchebag jocks from messing up a nerdy friend's move on a girl.
*after nerdy friend approaches girl and douchebag jocks are coming*
You: "Hey assholes! I'm a midget on a tricycle!"

Douchebag jocks: "Oh man let's go!"
Other friend: "You sure jockblocked Jimmy real good bro."
by Dane and Lylan October 30, 2011
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