Webinar - Nothing makes you sound more douchey than saying "webinar"
Shoot me an email - There are many things you shoot. An email is not one of them.
I'll grab you on that in a minute - this may be exclusive to my office/ company, but it drives me insane
Hunj- (Short for "hundred") - you sound like a douchey frat boy
Verbiage - THIS IS NOT A WORD
Fat-finger - This means to mistype. Perhaps you should just say "mistype".
Head's up - Just sounds dumb
Now tell me - what are your pet peeves?