"Can't Understand Normal Thinking..."
"C U Next Tuesday."
"Tuesday? He seems more like a Thursday kind of guy." (Like a "C U Next Tuesday" but a "C U Next Thursday" is so dumb it took them two more days to get there.)
FDLR - Front Door Lessons Required (So technically illiterate they need help to work the front door to get into the building.)
SMB - Stupid Mouth Breather
NTFS - Nobody (should be) This F****** Stupid.
LINUX - Lame Idiot Never Uses eXperience
DTMF - Didn't Take Much Fixing (User is unable to even do simple things for themselves)