Flick Wrist Bands
Marbles (They were huge for awhile and then went away)
Digimon and tomagochi pet things
magic the gathering cards
Nintendo Power (for awhile there in the early 90s you had to own nintendo power to be
cool but by like 1996 or so no one gave a shit anymore, I blame the internet haha)
Terrible music: Nsync, Backstreet Boys, Spice Girls, etc.
Good Music: early 90s buzz around bands like Tool, NiN, Smashing Pumpkins, and Nirvana
'Portable Gaming Devices' - for awhile it was super cool and everyone had to have either a game gear or an old school Gameboy, then after a year or two people stopped caring, I ended up getting my first Gameboy for free from a kid who got bored with his.
These things called Crazy Bones
Having an Atari (people my age, and around where I live) because of our demographic most of my friends and I weren't around for the original Atari fad, but there was this huge resurgence in like 1994 - 6 where everyone I knew was trying to get their hands on one because it was oldschool and cool
Flannel, Tye-Dye, and Faded Ripped Jeans - in the early 90s, the more it looked like you had a full time job at a local gas station the cooler you were.
Hockey Cards - these things always come in waves, for awhile everyone had to have hockey cards at my school, then just as quick as they came everyone stopped giving a shit
I'm sure there are tons more that I'm just forgetting. It's been awhile since I've thought back about the 1990s.
I come on every day and have no idea what Baltar is talking about.