A: you know what? B called me yesterday.
C: okay..
A: and then after that B... blah blah blah. and then B suddenly.. then B said..
C: man. do you like have HD for B or sumthin?
Used to be a tech term for high-resolution monitors back before HDTV became commonplace. Now, it's just a trendy term that can be applied to anything to increase its desirability.