The phrase "to need a refresher" means that someone needs a quick review or reminder about something they learned in the past, because they have forgotten some details or are a bit rusty on the topic. Full definition
For those of you who need a refresher on what the hell I'm talking about, go back and read Part 1. (legalblogwatch.typepad.com)
I just can't get enough of gallery walls, and have them sprinkled throughout my house now (they're in the bathroom and basement, if need a refresher). (evolutionofstyleblog.com)
If you're new to online dating or just need a refresher course, here are five essential online dating tips for beginners. (welovedates.com)