"Defrosted lemons" is a term used to describe a parchingly refreshed feeling someone gets from any event. Usually the subject whose "lemons" are being "defrosted" are in between the two words.
When my friend does something mildly impressive, you could say:
"Oh wow, that totally defrosted my lemons", or "You really just defrosted lemons, damn".
1. A really cool musician and Internet personality known by her fans for her series of remaking famous songs while her computer’s audio is muted, often with hilarious results. Her full first name is Devon. Also known as Dev Limes. (Dev please notice me you’re so cool)