Male or futanari ejaculation, the expulsion of semen through the shaft of a penis. The use of the tag implies that the picture tagged with it depicts the moment immediately after the semen is projected out of penis so it's clear where it came from, and that the aforementioned penis is seen within the frame of the image.
Use the female ejaculation tag for female ejaculations.
The following tags are aliased to this tag: ejaculation_between_breasts (learn more).
This tag implicates cum (learn more).