The one chuckle that everyone makes after the laughing has ceased after a joke.
Kelly: My right ass cheek hurts
Class: Hahahahhahhahhahhahhaaahahha
10 Seconds later
Class: Haha
Teacher: Did you guys just After Laugh?
similar in principal to the after shock of an earthquake- an after laugh is a laugh to any humourus comment which is made after the initial humour of the comment is lost...
Tom- it took Tom five minutes to understand the joke- and gave an after- laugh much to the annoyance of his friends...