show-n-tell 

When scumbags who ride the Baltimore MTA decide to show off their hardward; exchanging guns in an attempt to intimidate the other passengers. The participants will often eye-up the other passengers while smiling and sneering at them with the occasional, "what the fuck you look'n at motherfucker"

I was so scared after show-n-tell, that I had to go piss behind the woods in the parking lot after I got of the train.

show-n-tell by Mr. Asshole March 23, 2007

Show-n-Tell Sex Ed 

Sex education where demonstrations for the purpose of modeling proper sexual technique, safer sex protocols and better communication are performed usually for a live audience who's encouraged to watch and ask questions. Demonstrations may or may not include nudity or explicit sexual contact, but often do.

"Show-n-Tell Sex Ed is such a better way to learn how to be a sex ninja than watching porn."

"I went to a Show-n-Tell Sex Ed workshop where the sex educator totally hand-fucked a melon with a latex glove and some lube!"

"That strap-on workshop was a Show-n-Tell Sex Ed class and they pegged a dude in front of me and my gf."

Show-n-Tell Sex Ed by ReidAboutSex August 25, 2011