Abbreviation of 'Super Mega Awesome'. To be used only in situations of extreme levels of awesomeness. Considered level 3 on the awesome scale. See Mawesome, Pawesome, Fawesome for other levels.
shizawesome is a combination of the words shit and awesome, it would be used in a case when something is "the shit" and "awesome" all at once equaling to "shizawesome".
shizawesome is better then awesome.