Top Definition
a person who stops you getting close/hot/freaky/flat/sex with someone else; they always seem to turn up as things are about to get interesting.

jay: hi, Emily, whats up
Emily: come closer jay I'm cold
(jay puts arm around emily)
george walks up hi guys can I chill with you for a bit
jay: get lost you prone blocker
by slicesliceroflknife October 27, 2008

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