The main character in the novel I'm writing has a teenage son. I think I'll have him use a bit of today's slang. Here's a translation that I found:
Dope - Cool or awesome
GOAT - "Greatest of All Time"
Gucci - Good, cool, or going well
Lit - Amazing, cool, or exciting
OMG - An abbreviation for "Oh my gosh" or "Oh my God"
Salty - Bitter, angry, agitated
Sic/Sick - Cool or sweet
Snatched - Looks good, perfect, or fashionable; the new "on fleek"
Fire - Hot, trendy, amazing, or on point (formerly "straight fire")
TBH - To be honest
Tea - Gossip, situation, story, or news
Thirsty - Trying to get attention
YOLO - "You Only Live Once" (often used ironically)