Age gap

I have a friend who's five years younger than me, and usually I don't notice the age gap, probably because of my maturity, or lack there of. Once in a while though....so there we were hanging out at Timmies, like all the cool people do, and I was psyched about the deal I got. "Cat food is on for 41 cents a can at Costco! THAT'S CRIMINAL!!" And they all stared at me, blinking.

I few things that have come up that I just don't understand: 

Truffle butter
Peacocking
Broskie
Bearding

...and the list is growing. I swear those LG's are getting creative these days!