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1.
To fully understand the true meaning of Spagack, one must picture having it screamed at you by a half-crazy, teenage trailer trash guy in a violently yellow shirt from a car driving past at insane speeds, while you stand on the sidewalk and wonder what the fuck just happened.
"Oh man, I'm spagacked outta my gourd."

"SPAGACK!"

"Basically, I just want to go to this rave tonight and get totally spagacked."
by Amolerouth April 29, 2004
 
2.
Tweeked, spun, Methamphetimins or the act of being under the influence of methamphetemins.
"She went and got spagacked last night." or "He went and bought some spagack."
by WebWolfAlpha February 08, 2005