It's basically a simp, who only perceives others as someone attractive/future partner.
First they see (spermiage can be of any gender) is the looks of others.
*watching a reality show*
-- Wow, look at her/him, she's/he's so attractive.
-- Holy fuck, dude, can you focus at the show and not at the looks of others? You're such a spermiage.
Spermagulation is semen clogging the urethra. This side affect occurs if you do not urinate shortly after sexual intercourse or masturbation. It can become quite painful if this is not taken care of post haste.
"SHIT! My penis is on fire! I should have cleared out my urethra sooner than later to avoid the retched spermagulation."