Acronym for Fifth Harmony, an American girl group formed on X factor USA in July of 2012.
Jessica: DiD YOU HEAR 5H's NEW SONG??!?!?
Mary: 5H? Whats that?
Jessica: FIFTH HARMONY!!!
Mary: OMG YES I HEARD IT. FRICKEN LOVED IT.
by ayyejauregui April 15, 2015
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