Crank, lower quality methamphetamine not the higher quality crystam version but the stuff that is brown some times and burns like hell. There are 2 types of gack. One eye and two eye. One eye refers to the burning pain and tearing in the eye after snorting. Two eye gack makes both eyes burn and water from snorting it in one nostril.
"I did some gack last week and I still feel like shit!"
Good or drunk or fucked up. The west side of Chico california is dominated by low cost student housing. Many parties happen on the west side of town and most of the hot young women that attend California State University Chico live on the west side as well. West side has come to mean many things from exceptional to to terrible.
It would be halla west side if you fronted me a sack.