When the creators of a work, likely on studio, network, editor etc. insistence, tries to get wide popularity for their project by adding in lots of elements that have worked in other successful shows.
This is not the same as making something widely appealing, which is more about not including anything that will drive away a particular group. This trope deals with deliberately going after as many specific demographics and fandoms as possible.
While this sounds good on paper, viewers/readers/gamers aren't stupid and often recognize what is going on and resent the show for it. Either that or the differing elements clash with each other and act to essentially cancel each other out.