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n. A person who is arrogant, silly (in a ridiculously exaggerated sense), or simply funny in a very unorthodox manner.

adj. When something is funny, but only because of its sheer idiotic nature. Ex: "What a momon joke!"

Etymology- Some historians believe the word comes from the latin or modern Spanish/Mexican word "Mamar", which means to suck. After such massive immigration from Latin America, the word must have later evolved into what we now often use in the workplace or school.
"Wow dude, you're such a momon"
"Man I hate that guy, he's such a momon"

This may sometimes be heard but with the adjective form instead, like so: "Man I hate that guy, he's so momon"
by Foxy Vincent April 03, 2010
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