I believe that the word originated out of a typo (or bad spelling) in the internet. Once people read the word "smaked", they realized how much sense it makes. Not only does it ring off the lips properly, but it adds a whole new dimension to the list of phrases marijuana users have at their disposable in order to describe their mental state.
Normally it's common for users to become smacked or high. But when one achieves a level such that he is both smacked and baked, he can truly proclaim that he is smaked.
If typed, generally accompanied by horrible spelling and grammar.
2) Intoxicated, acting stupid, actin unswagglery
Dis dude smaked.
cali got me smaked
Did you just break my bong? you smaked piece of shit!
sory for bein a hotboy im smaked