This post is fairly straightforward. Enjoy.
1. The act of two (or more) men ejaculating simultaneously, or within a 5 second time frame of one another.
Related: synerjizzed, synerjizzing
Ex: “I’d really love to synerjizz with my boyfriend someday.”
Ex: “Omg, the sex was so hot, we synerjizzed.”
[Origin: American, offered by a regular Word of the Gay reader and gay phrasologist.]