OK, I'm not "hip", cannot say "safe" in a convincing way, dislike the use of "mate" and have no idea what other "modern" slang I'm missing out on (ouch -- I'm mid-thirties and no-longer modern ;-) but this report from the BBC seems a bit sour-grapes: Students bemoan 'unhip' lecturers.
It's pretty funny that the BBC's CMS also brings-up a related article under "See also", now 3 years old, where lecturers were getting image consultants. "Give a firm handshake and look them in the eye" that'll solve all the problems we have with today's students? Well, you let me know how that goes ;-)