Bag

A feeling encompassing a host of negative emotions, ranging from general malaise to unfathomable hopelessness.

Can also be used as "baggy"

Person 1 to Person 2: "baaaaggggg."
Person 2: *nods in pathetic agreeance*

Person 1 to Person 2: "I am so fucking baggy."
Person 2: *nods in pathetic agreeance*