Not sure what's still said in the common parlance, particularly since I haven't lived in the US since 2004. With that in mind, here is a little glossary in case my characters say something that may make you scratch your head.
'90s Slang
Aiight: All right, but cooler
Alrighty then: a sarcastic reply
As if!: another sarcastic retort (short for "as if that would really happen")
Booyah!: an expression of enthusiasm, pleasure, or approval
coo: cool (no one liked to enunciate in the '90s)
(to call) dibs: to declare the right to have something before someone else
dude: a casual way to refer to someone (at first, as an alternative to 'man'; later gender-neutral)
hella + adj: really + adj. (e.g. hella cool)
man: an alternative to dude, usually only for guys
NOT!: a way to reverse everything you just said; sarcastic
peeps: people
phat: awesome times 10 to the 10 billionth power
Sup?: What's up?
sweet: alternative for awesome or cool
That's wacked: That's so weird/messed up.
trippin': freaking out; acting weird
Whatever: said in a sarcastic tone; to indicate one doesn't wish to speak any longer
Whazzup/Whassup?: originally in a Budweiser Super Bowl commercial. It caught on. 'Nuff said.
wicked + adj: (New England slang) totally/really/very + adj. (e.g. That's wicked awesome!)
You go, girl!: I'm so proud of you!
Hmm, it wasn't a very subtle era, was it? :D
Textspeak (Acronyms and Abbreviations)
AFK: away from keyboard
A/S/L: age, sex, location (often as a greeting)
ATM: at the moment
BBL: be back later
BRB: be right back
BTW: by the way
G2G: got to go
IDK: I don't know.
IRL: in real life (as opposed to one's online persona)
jk: Just kidding
l8r: later
LMAO: laughing my ass off
LOL: laughing out loud
OMG: Oh, my God!
OIC: Oh, I see.
OXOX: hugs and kisses
pls/plz: please
ppl: people
qt: cutie
ROFL: rolling on the floor laughing
STFU: shut the **** up
TC: take care
TTYL: talk to you later
WTF: what the ****?
ZZZ: bored or sleeping
Outdated Terms and Concepts
AltaVista: one of the first search engines before Google became prevalent
AOL: America Online (back in the late '90s, it was the first internet provider to offer users unlimited access to the internet for a flat rate instead of paying by the hour or minute)
AOL Instant Messenger (AIM): one of the first texting apps (before that was a thing) that allowed you to communicate with people online; it wasn't mobile, however
blocking someone: the equivalent of 'muting' someone nowadays; blocked users were unable to send messages to the recipient who had blocked them
(dial-up) modem: a way of connecting to the internet that dinosaurs like me had to use before there was broadband; you connected to an internet service provider like AOL via a landline
instant messaging: the equivalent of sending someone a PM/DM nowadays in social networks; only the recipient can see what you're writing; later allowed peer-to-peer file transfer
LiveJournal: one of the first websites in the late '90s that allowed you to create blogs, before Facebook, Twitter, and other social media networks were invented
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Mask of Celibacy: A Multimedia Novella
General FictionHigh school senior Jess Smith meets Ace of Spades, an online friend who helps her question her mask of celibacy and recognize her true asexuality. Except that their friendship begins to develop into something more. [Featured April and May 2020 under...