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1.
An advert that is predictable and boring, and just plain saaad.
"Did you see the latest toothpaste commercial?"
"Yeah, what a sadvert."

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"Justin is putting arms and legs on a product, again...."
"Yeah, he's going to win a gold lion in the sadvert section."
by p-haze April 06, 2010
 
2.
An advertisement (television or otherwise) that, rather than causing a desire for a product, induces a repulsion from said product due to the use of popular entertainers such as Michael Winner and/or Dale Winton(eg.).

A really sad advert.
That advert for pile cream really sucks. What a sadvert.
by Bernie the Cow January 25, 2005