80's 90's zombie movie

[monster898989]

can anyone please help me figure out what movie I'M ABOUT to explain.OK here it goes.something about zombies or bums beneath the streets and it had weird music one guy was sitting on a toilet in a field I think. IT'S heard to remember It was so long ago. Also they were playing catch with someone's testicles that was cut off.I know that sounds weird,believe me. my dad could pick some winners.my brother and I watch this movie in horror years ago and my dad past on 16 years ago and my brother and I want this movie but have had no luck. I THINK it starts out a guy and girl on the run  they stumble upon some homeless people and dude takes a p**s through the fence and the trash people or what ever they were cut his penis off anyways I know this sounds weird. someone help me thanks

[Shadow]

The mention of bums (and one on the toilet) and people playing keep away with one guy's penis is definitely from Street Trash:

http://www.badmovies.org/movies/streettrash/index.html

Though there were no zombies in that film. Just people melting from some funky booze.

[Andrew]

What jumps to mind is "Street Trash."

A review:

http://www.badmovies.org/movies/streettrash/index.html

[Andrew]

The mention of bums (and one on the toilet) and people playing keep away with one guy's penis is definitely from Street Trash:

Ha!  Mere seconds ahead of me, you little bugger!

[Shadow]

That's me: Mr. fast. Though the wife hates it...

[Joe]

that fits almost perfectly