Your original text even was only triggered when someone said "!memo" and nothing else. drowsy added "*" to the end, which means anything that starts with "!memo" will trigger it, e.g. "!memohelloworld" or "!memo hello world".
The other change that drowsy did was the "-" after "$3", which means it will list all the tokens after that too. "$3" alone would only list the third token.
