An individual that stresses he has lost his virginity, but we know they are lying by their lack of details on the event in question. They're strong fetish for Valorant fuels they're ability to make kraft dinners and brag about union work. They are simply unable to pay attention to a conversation taking place and later need to be reminded the keypoints multiple times over the course of an hour.
In class:
*Student walks up to the white board in the middle of class and draws a smiley, then sits down without being seen*
Teacher: "WHAT NIMNODE WOULD EVEN THINK OF A STUPID IDEA LIKE THIS TO DRAW A SMILEY IN THE MIDDLE OF CLASS!!?!?!??!?!?!"
Clueless person. May be spaced out, oblivious. Common sense and/or common courtesy are alien to them. Applies to both someone who is unintentionally/passively irritating, and one who is deliberately so.
It's a silly put-down, so chances are after you use it your anger/annoyance will subside a little.
"You nimnoid, you swiped the last ice cream sandwich! You knew I wanted that!"
Someone cuts you off in traffic. You shout after them, "NIMNOID!"
An obnoxious person finally vacates your personal space. You mutter after them, "nimnoid..."