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1.
The annoying, and sometimes disgusting advertisements found on the side on myspace, and facebook pages, and is also mostly found while watching porn.
so i was on redtube, and ther was a plethera of bondage sidevertisements! ICK!
by la-x-man12 December 30, 2008
 
2.
The way of showing an advertisement which is tilted on its side. (T.V. commercials, Print ads, Billboards, etc)

An effective way to get the attention of everyone.

Coined by UltaMagnetic Moe (UltraMagneticBlog.com)
That sidevertisement was so effective that I had to buy their product!
by UltraMagnetic Moe September 12, 2009