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."
2. Gary: "My poem begins, 'a flock of seagulls cawed with the setting sun'..."
Allison: "Shitsweak, shitsweak! Shit is WEAK!"
Rob: "...Not as bad as your face" <- (Bad comeback)
Stu: "Shit's weak!"
(Rob gets sniped)
Stu: "AAAAAwwH! Shit's weak, man"