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four block is a word to describe someone who always lets you down or is never there when you need them.

this word originated from the game tetris, the streight "four block" that never seems to come when you need it.
You didn't pick me up from school, your such a four block
by Fakesanta March 17, 2008
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2
Someone that is not reliable. Relating to Tetris, the four block piece is never there when you need it.
Man you're being a four block.
by Stag32 March 22, 2017
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