a waiter or bartender is working in a very loud bar or restaurant and cannot completely hear
what the customer
is saying but they start
to laugh when
they thought it was a time to insert laughter.
also known as a courtesy laugh when
says something at all remotely funny so you use the waiter laugh
or bartender laugh
to make the customer
think they are funny.
I was table-side when the family
was talking to me and I started
using my "courtesy (waiter laugh or bartender laugh) laugh" when Mr. Young
told the same story he has told 45 times previously.