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Brood X (10 in Roman numerals) describes a "brood" of periodical cicadas, within the genus Magicicada, that emerges from the ground once every seventeen (17) years in parts of the U.S. to scream, mate, and die within a few weeks. They look mostly black with some orange highlights and have beady, red eyes. Not all places seem to get them, but in mature forests they are able to congregate in numbers high enough that they don't all get eaten.
The last time that Brood X emerged was during 2021. They also emerged in 2004, and the next time they will emerge will be in 2038.
Brood X by WhoDatFreshBoi June 21, 2021
Related Words

Gastric Brood 

A fetish that acts as a mixture between emetophilia, oviposition, and vore, inspired by gastric brooding frogs (Rheobatrachus). Describes the process of swallowing fertile eggs, having them hatch in the body, and being regurgitated. Eggs are often that of worm-like creatures such as snakes, maggots, or centipedes, to enhance the focus on wriggling and squirming in the host's stomach.
Person A: Dude I just saw some fucked up hentai where a giant wasp laid eggs in a girl's stomach, and when they hatched she puked them up. Can't believe some people get off to this.
Person B: Oh yeah, that sounds like some Gastric Brood shit.
Gastric Brood by Heruppe March 1, 2021

Dude Brood

A dude brood, or dude brooding, is defined as when a man (dude) thinks moodily/anxiously or sulks.
"I heard Geoff got dumped by that slut Alicia."

"Yeah, he's having a dude brood session right now."

"What a puss."
Dude Brood by Justin Herbert April 10, 2009

under[brood] 

The best outwar crew ever. No other crew even compares.
Scrub is a member of Underbrood because he kicks ass
under[brood] by White Sox Rule June 21, 2004

alien brood 

She has alien brood in her hair
alien brood by doo doo dicky September 6, 2003

mood brood 

That girl was going through a mood brood after she broke up with Jim.
mood brood by Ereck Flowers May 3, 2019