To the end that "tipping" refers to enjoying the occasional road soda whilst cruising with a friend down your local thoroughfare, a tiptarded individual would be one that did not learn to drink while riding in a car at the appropriate age, and therefore is not ever capable of mastering such as skill.
"Dude, that was totally 5-oh that we just passed. Why the hell would you take a drink of that Old E forty just then?? You are so tiptarded..."
by dissident19 July 10, 2009
When someone goes to a restaurant and tells the server to "keep the change" like it's a good tip when it's not.
by Server life November 3, 2015