Sweetman is a term used when to described a male with huge penis - this term is believed to come from Sweden; where it is pronounced Svetmanne (s-vhet-man-er).
A combo of "massive smash" and "Shizer" A turd that is so large normal English can do it no justice, thus the butchering of the Scottishlanguage. Other combos inlcude mc-fizenberg and shizer-mcnuggen-fife.
I ate a whole can of oat meal then drank a gallon of coffee. I let the atom bomb in my intestine solidify, then took a mc-sheethan so big, there was a birth certificate in the toilet.