(Note: I'm part of the "I know bits and pieces of Japanese from watching anime" group, so I lack an in-depth knowledge of Japanese)
As I'm hearing Japanese occasionally there will be an English word said. Lots of the time there seems to be a suffix on it. Here's a random sampling of words and what the suffixes sound like:
print-o fight-o deep-eh speed-o rock-uh type-eh print-eh rope-eh boss-eh
As you can see there seem to be 2 major suffixes: -eh (or -euh, depending on the person saying it) and -o. Are there any rules on which to use? Does it even depend on the person or area the person is from?