Scammy means anything that is and/or related to a scam. It can be
an Internet site or any other written material or media that promises something for free yet later lies about it and 'requires' items such as money, ID, or
personal information.
And even if you did give out those items, like money or ID or clicking on ads signing up for items because it says you 'must complete one online purchase' before you can start your download.
In the end, you still are not given what you were promised. That site or service is then scammy.
Jack: "Dude, I just found this awesome site where I can
download movies.
for free."
Jill: "I know the one you are talking about, but it's scammy. They ask for your
credit card to 'verify you are an adult' when you try a download."