joe schmoe

Etymology:

• Joe Shmoe, is one of the most commonly used fictional names in American English. Adding a "Shm" to the beginning of a word is meant to diminish, negate, or dismiss an argument. It can also indicate that the speaker is being ironic or sarcastic. This process was adapted in English from the use of the "schm" prefix in Yiddish to dismiss something; as in, "Fancy, schmancy". While "schmo" was thought by some linguists to be a clipping of Yiddish שמוק "schmuck", an etymology supported by the Oxford English Dictionary, that derivation is not universally accepted.