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...a co-worker or peer who is so lacking in talent or skill that the only abillity this person has is to impede the progress of anyone else showing talent, skill or motivation.
Term is from behavior recognized in young siblings who throw blocks in front of younger siblings to impede them from learning to walk
Joe is so lazy and worthless...he is a block thrower...all he has done all week is get in my way!
by blockthrower September 20, 2010
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