What does 万年～ mean?
万年～ is a Japanese prefix meaning “perpetual ~ (prefix)” in English. It is written as 万年～ in kanji, まんねん～ in hiragana, and mannen～ in romaji. This word is part of JLPT N2 vocabulary.
NotePrefix for something that never changes (万年床 = bedding that's never put away).
Example sentences
彼は万年床で寝ている。
He sleeps on a futon he never puts away.
あのチームは万年最下位だ。
That team is always bottom of the league.