While "buck wild" has been a phrase for a while now, it is currently experiencing a resurgence of popularity.
"Buck Wild" pulled a Diddy and shortened its name to stay hip and relevant. And it worked! Now all the kids are saying "buck." Keep your ears open and you'll hear it. However, you might be unsure as to its exact meaning.
Buck: (adjective) wildly, insanely, inappropriately, boarder line-dangerously, FUCKED UP. Or, just wild, insane, or inappropriate. May or may not be the result of substance consumption.
Q: Can you use it in a sentence?
A: "Look at that wild bitch over there--she's buck!" or "Last night was so buck--I lost my phone and ended up in Baltimore at 6 am." or "Dude, I'm gonna get so buck tonight."