interjection
Strong, rude imperative telling someone to disappear. Equivalent to 'get lost' or 'fuck off'. Used in anger or extreme annoyance.
See also: 消え失せる
消え失せろ！二度と顔を見せるな。
Get lost! Don't ever show your face again.
うるさい、消え失せろ！
Shut up and get out of my sight!
消え失せる is the dictionary form verb meaning 'to disappear' or 'to vanish'. 消え失せろ is its imperative form used as a strong interjection.
あっち行け is a less vulgar but still rude way to say 'go away'. 消え失せろ is harsher and more aggressive.
Imperative form of the verb 消え失せる (to disappear, to vanish).