used to recommend the saidaction to someone else who is clueless as to what a third party is talking about. It is usually insulting to the first party.
Person 1: Oh man, the Teletubbies concert was rockin' last night!
Person 2: (silence, confusion)
Person 3: (to person 2) "Dude, just smile and nod."
Combination of actions developed over centuries by males who were tired of hearing and having to come up with responses to their girlfriends' incessant babble.
"And then like, oh my god, I got these cute grey and white shoes, they're so cute!! And next weekend, we're going to buy these black and white ones...."
What one resorts to after they've said "what?" too many times, and STILL can't understand what the hell the other person said.
Person #1: Wew gan udait widme?
Person #2: What?
Person #1: Wew gan udait widme?
Person #2: I'm sorry, I can't understand you. What'd you say?
Person #1: Wew gan udait widme?
Person#2: *Nod and Smile*
Person #1: Yes! That hot chick just agreed to go on a date with me!