Top Definition
The peak of sexual pleasure while listening to Niall Horan Sing.
Kayla: OMG Have you listen to One Directions new song "Over Again"?

Casper: You know it!!!! I had an extreme Niallgasim when his part came up!!!!

Kayla: Me too!!!! His voice is like sex for your ears!!!!!
by C4$P3R November 07, 2012
5 Words related to Niallgasim

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