When you are overly high or drunk. This can be from several things ranging from nicotine to weed to lean to alcohol. To know if you are schmacked look yourself in a mirror and see if you can stand still. If this objective is failed then your SCHMACKED.
Mike Hunt : yo dawg I was schmacked asf last night.
Barry McKoginer : Damn i was scmacked on tuesday.
to be extremely drunk or high, but at the same time, enjoyable.
Also used as a verb to "shmack", or as an adverb as in "shmacking."
"this video shows others in their words, getting "shmacked""
"i'm obviously shmacked as hell right now"
"walt thank you very much, more on shmacking, later"
"to commerate being shmacked the creators of the video are now selling T-shirts."