There's been a lot of abbreviations that I'm not sure I understand. Internet language

Was just gonna ask for the "imo" and what i believe to be conductions of it "imho" and "imnsho"

As I am still new to these I can only guess, but what I thought "imnsho" means when I read it.. just a feeling based guess... My first thought was "in my no-shít honest opinion" am i anywhere near the truth?
Sometimes all the abbreviations royally bug me, cuz it of course makes understanding what is said even more difficult, but at times the quessing can be fun