Originally from Sapporo, Japan, a shidmaster is a specialist in retaining huge amounts of bowel encrusted fecal matter for weeks to months as a form of meditation.
Shidmasters in India are known to be able after months of non-functioning bowels, give themselves, only through anal suction, deep colonics to release the dangerous build up of waste.
"Hey, I'm not sitting around that guy; he looks bloated and is definitely a shidmaster looking for some weird fun"
"Hey Shidmaster, drop me a few nuggest of shid"
Shiddashadda is when a person is very very tired after a huge night out and is invited to another event but cannot go as they shiddashadda, IE should have but are shattered...
raver 1: yo shall we go out and gets g-rhymey to some gutter oonst