A taunt, combination of "shit is weak," made for hollerin at some asshole(s) pullin some weak ass bullshit; also for use during sporting events to diss the other team; can be used also when one has just been defeated, to further demean them and their weak ass beer chugging/video game playing/attempt at profundity.
1. Damn, UF just lost to FSU again, fuck yeah!...shitsweak!
2. Gary: "My poem begins, 'a flock of seagulls cawed with the setting sun'..."
Allison: "Shitsweak, shitsweak! Shit is WEAK!"