Usually a term used by 4 - 10 year olds to describe their underwear. This word is often used by Hipsters because it's incredible ironic and non mainstream. A lot of hipsters are turning to under pants because of their nostalgic feel, it reminds them of their past.
1) to be the worst of the worst. the bottom of the barrel.
2) a house sound guy from a horrible place in the middle of the US ( in Japan pronounced unjapans )
3) A club that is run with the worst staff possible ( club underpants)
Male underwear worn under a pair of trousers or pants. Many people, mostly in the south of England, believe that underpants and pants are the same thing, which clearly isn't possible.