Mindwash

a more accurate way to say brainwash

"Don't join that cult, man, they're just gonna mindwash you!"

Overpreached

when something is overrated, talked about too much, praised too highly

"I hate that TV show but I keep seeing content about it on social media, it's definitely overpreached"

Plus-plus

an alternate to "win-win", when a scenario is beneficial for both parties.

"buy me a new perfume"
"why?"
"i'll be happy, and you'll get to enjoy the smell. It's a plus-plus"

Dirt talk

an alternative to "trash talk", when trash doesn't quite do it justice. Can be used interchangeably, or as a stronger version, or as a more playful version

"I'm gonna crush you at Mario Tennis later today"
"ooh, dirt talk"

Flat up

When a bubbly liquid, like soda, goes flat

"I hate buying 2L bottles of coke, they always flat up quickly"