Meaning "shit is
weak", this phrase is
appropriate when a person, object, or event is weak, not as
cool as originally thought, or otherwise lacking.
Examples of when it is appropriate to use this phrase:
Your friend posts a video of a
rice rocket on Facebook, exclaiming how cool it is, but it isn't. You comment "
Shit's weak."
You buy some espresso from Starbucks, only to find that it isn't as delicious as everyone says. You mumble, "Shit's weak."
You go to a party only to find that most of the attendees are not of the opposite sex (or not of the same sex,
whatever floats your boat). "Shit's weak."