A simplified version of "the grossest". Meaning a person or object is the grossest one has ever seen.
That guy is a grotis!
Did you see that? What a grotis!
That girl that just walked out of that trailer park was surely a grotis!
The annual celebration of one's divorce. A divorce anniverssary.
John is celebrating his 2nd divorssary from that cunt Marci.
Hey Barry shouldn't we be toasting beers for your 3rd divorssary?