An Eamonn Share definition Flag Eamonn (Verb) (a•men)The act of accidentally having sex with your best friends younger brother Man 1: Bro I did an Eamonn yesterday. Man 2: Damn bro, my condolences. An Eamonn by Toast Taste Good November 26, 2021 0 0 Get merch Get the An Eamonn mug. Buy Now — $32.95 See more merch