A home brewer may use a lot fancy words to describe their beer to help their friends understand what's being handed to them.
While most beer drinkers get "hoppy", "malty", and "bitter" there's a lot of other terms that home brewers will use to try and accurately describe their beer, while trying to hide that it probably wasn't exactly what they were going for. And much like a haircut, it's bad when it's not what you wanted, no matter how much everyone else raves about it.
So here's some common excuses (not saying I've actually used some to most of these) and what they might really mean. If you're not sure, ask "what were you going for?"