social ejaculation
To reach a non-sexual climax in a social situation which results in immense relaxation and low energy, often followed promptly by a withdrawal from the interaction and deep slumber.
Wow, that guy was so excited last night when he arrived at the party, he told all of his stories to his friends and experienced social ejaculation within a half hour. He was later found snoring on the couch, unresponsive and content, all the while sober.