As much as lingo drives me up the wall, I have to admit that I lived in the 80s and said all kinds of horrible phrases so I can't really blame kids these days.
Ah, the 80's. We all used Valley Girl accents and phases even if we lived in the midwest. It's a wonder our parents and teachers didn't smack us (though I'm sure they, like, you know, totally wanted to).
I grew up in the 80s and lived in the San Fernando Valley during most of that time so, yup, I'm actually a Valley Girl (hence the screen name). However, even I tired of hearing the Valley Girl (and Valley Dude) intonations and, when I started working in a drugstore in SFV, I made a conscious effort to get the Valley Girl-ness out of me, especially when dealing with business calls, because I felt it made me sound really dumb (okay, honestly, I thought others who talked that way sounded dumb also).
As for annoying trendy expressions:
my bad (always hated that)
bucket list (on the top of my list right now and I can't really explain why I despise it so much)
psych (popular when I was teen and I never ever ever used it)