Possibly the worst insult there is. I am most likely breaking the law by writing this definition. Please only use this insult in a very serious conversation, as anyone who is easily offended will get you punished.
"God, Karen is an actual meaniepants"
"Uh.. You dorealize what you just said, right?"
Mannypants:
A type of pants that easily slip off and pool around the ankles while the wearer is drunk or high and eating sliced cheese. Origin is unknown, but the pants after which the phrase was coined were mainly purple in color, possibly a leftover from the "80's surf revival".