I'd never even heard—much less knew the definitions—of more than half of these (in red)…
Oxford Word Additions for February 2013
appletini
Baggy Green
biosimilar
blootered
braggadocious
burrata
cane corso
cruft
dumbphone
feature-complete
flexitarian
FOSS
friend zone
hump day
metabolic syndrome
omnium
range anxiety
schlumpy
sillage
social sharing
SSD
touchless
tray bake
tweetable
upcharge
voluntourism
(Source)
as a doctor and a nutritionist I use 'metabolic syndrome' all day long.
While I love learning new words to increase my lexicon, none of these words seem attractive to me – the one exception is blootered. That one I have to look up.