1. To make a broad statement based entirely on ignorance.
Statement could also be based on rumor, and/or negative or positive popular opinion.
2. To project your opinion of a particular subject as what everyone else's opinion should be.
Example 1. Person 1, "Brah, Circuit City is lametastic
" Person 2,
"Do you have anything to base that on?" Person 1, "Well..
no." Person 2 "Dude, you're so clemtatious!"
Example 2. "Hey man, do you like Metallica's new stuff or old stuff
better?" Clemtatious guy says, "Dude, Metallica sucks"
To avoid being clemtatious, he could of said "Dude, I
don't like Metallica"