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1.
to mean something is really lame.

Comes from drugs, when the drugs have been cut too many times it would be weak shit.
This cocaine is some weak shit man.
by Sir K May 24, 2005
 
2.
Drug world terminology used as metaphor in straight world which describes someting derisively.
Your argument regarding Israel's human rights record is some weak shit.
by Andy Renko August 26, 2006