A term often used in rhythm games such as osu.

A shitmiss is when you miss without realizing why, seemingly for no reason. It can also be when you miss an easy hit, usually repeatedly. A shitmiss usually occurs in the form of a choke.
Guy 1: *almost FC, chokes*
Guy 2: lol
Guy 1: I KEEP SHITMISSING FUCK THIS GAME
Get the shitmiss mug.