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.
Jack failed to ejaculate during sex with Jill but successfully came afterward while eating a bowl of cereal in a phenomenon known as post mature ejaculation.
A thought or realisation after ejaculation whereby you have, either, random or relevant thoughts due to your mind now thinking clearly without sexual hormones being active.
After sex:
Girl: Hey baby, what you thinking about?
Guy: I was wondering why Woody and Buzz were named after dildos.
Recollection of sex:
Guy 1: Did you have Post Ejaculation Thoughts?
Guy 2: Yeah, I realised I didn't want to be with her.