1 definition by Simp2
A high tempered Irishman who loses his cool multiple times a day and tends to blame others for his short comings. To make up for their small packages, a Seamus overcompensates by excessively calling everybody around him a simp and constantly checking himself out in the mirror. You can see a typical anger outburst while playing call of duty
Person 1 : Did he really just throw his game controller through the t.v.?
Person 2: yeah, he's really being a Seamus right now.
Person 2: yeah, he's really being a Seamus right now.
by Simp2 February 20, 2021