this is when a guy or a girl or a shemale rubs there hand in an upward then downward motion surrounding their cock. this will eventually lead to cum, or sperm coming out of the penis head, making a big mess to clean up.
My big ass Ejaculat!on left a mess all over the bathroom mirror, so i left it there. then my mom walked in and said "who the hell let a shower of sperm on my godamn mirror."
When your mind and body becomes so overwhelmed with such ecstatic joy while delivering the father of the groom speech that you yell out at the end "I'm having a mental ejaculation of joy" and then drop the mic.
After some confusing talk, Jesus got frustrated with the human language and shot out through the roof like a celestial ejaculate, right onto the bosom of heaven.
Richard: "So, what happened to the Becky girl you saw last night"
Chad: "Well, she was a 6/10, I've seen better, so I had to Ejaculate and Evacuate. I think I may have even left my pack of gum there"