to slap a girl across the face (us. just for guys)
Chris: If you don't stop talking about Josh I will gardy you so hard!
Morgan: OMG WTF!!??
Hannah: Did you hear that Gardy gardy'd Morgan last night? What the hell dude, you don't hit a girl.
A current state of enlightenment
Dude. That sandwich was so good I'm like gardy right now." or "We're gonna party until we're gardy!