Being rude, disrespectful or orderly.
"Why are you so lumpatious?"
Someone who is mean, snobby, rude, etc.
That man is so lumpatious for making fun of you!
A word used in the television show Sam & Cat. Used as an insult to someone who is unpleasant and idiotic.
You're so lumpatious!
A "non-flat" butt.
More specifically, an old man's daughter's butt, even more so if that old man appeared on Tomorrow's Teachings.
"Well they must be blind because your butt is quite lumpatious"