a self-inflicted cumshot is where a male either deliberately or unintentionally ejaculates into his own face.
1.) troy was masturbating at his computer when all of the sudden he received a self-inflicted cumshot when he nut in his eye.
2.) tucker was fucking a chick doggie style when his dick slipped out and ended up nestled between her ass cheeks right before climax; when he looked down, he nut right in his own eye.