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1.
Slang in Eastern Massachusetts for apathy and condescension.

Circa 1994 was used interchangably with a general disregard for all authority figures and instead always having a good time
Dude 1: "Dude, are you working this summer?"

Dude 2: "Nah I'm thinking I'll just Moynihan it all year. "
by 3Stones June 26, 2011
 
2.
Slang for prostitute in west of Ireland
You are dressed like a moynihan.
by brian Mcfadden November 15, 2008
 
3.
(adj.) used to describe someting you feel is rather femine or homosexual. use of this word may lead to anger blow ups and quiting of video games.
My dog was riding its bike and fell off it felt so Moynihan. :(.
by mass erect. April 21, 2011