Well it kind of depends on your definition of trashy...I like to think of these movies are having character
They're also the best movies ever and anyone who says different is a dirty dirty liar!
Army of Darkness
Groovy
If you've ever wondered why Bruce Campbell is considered the sexy geek beast of a man that he is, watch this movie and you will learn. Hilarious movie with a plot so ridiculous that it has to be seen as awesome. In one hand is his boomstick and his other hand is a chainsaw. What's not to love?
Starship Troopers
Would you like to know more?
Blood and dismemberment everywhere!!!! Not only is it a great movie but it's a fairly smart satire if you're paying attention. Also, Neil Patrick Harris is in it! Sure...he only gets like, fifteen minutes of film time but still, NPH! Giant bugs have attacked Earth and therefore the only good bug is a dead bug!
Boondock Saints 1 and 2
In Nomeni Patri Et Fili Spiritus Sancti
I have bought these movies so many times that I may have single handedly given them the money to make Boondock Saints 3. Saints 1 is one of the best revenge movies ever and, while it seems you either love or hate Saints 2, I personally loved it and welcome it with open arms. I also believe that (at least the first one) opens an interesting discussion on justice versus the law.
Go see all four of these movies for they are all awesome. You will thank me later.