Teenage Bullshit

(Noun) Def: The years in your life when who slept with whom was both news and important, a topic of discussion and a reason to be angry.
Often used as a pejorative, specifically toward post-high school gossips as they age into their late twenties.
See also: slut shaming.

Example: my 18 year-old friend just called me crying after someone at a party just shamed her for sleeping with some guy, and I tried to be supportive while thinking, "This is some serious teenage bullshit".