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A pair of men's briefs or boxer briefs that have a fun design/pattern on them.
He was wearing pair of watermelon fundies, there were seeds everywhere!
Fundies by TwinkleWinkleLittleLiz August 12, 2015
A magic pair of underwear that bring you fun success.
It's never a bad night when you have your fundies on.

She woke up in a mansion. It must of been the fundies.
Fundies is a slur used against lesbians, lesbians are the only ones aloud to say and reclaim it. Fundies is what the homophobic boys, and girls, are saying when they are making fun of lesbians.
Homophobe: Omg! Is that a dyke?
Lesbian: Don’t call me that. It’s offensive.
Homophobe: Um.. I don’t think its offensive. I think its Fundies!
Fundies by thatl3sb1an July 24, 2020
The absolute maximum amount of trolling one can comprise. Whether it be on the internet, or in a video game. But most importantly, when it occurs the troll must shout "Haha, Fundies!"
Today we played Smash Bros. and I showed off some of my newly learned fundies with Captian Falcon.

The look on my friend's face was absolutely priceless!
Fundies by SwiftY_92 October 18, 2021
Short for a stock's fundamentals (PE ratio, price to book, DCF, etc). Often seen on WallStreetBets, but disregarded by ape hodlers.
Fuck the fundies, man, GME to the MOON!
Fundies by deathettaxes January 28, 2023

Fundies on the Tundies 

Having good fundementals on your tundementals being good with the basics. Or being a hoe.
Ex: Mufie had bad fundies on the tundies.