Anecdotal sources suggest that the phrase, "keep it a buck" means "dont lie, tell the truth."
Slang is very informal language or words used by a particular group of people. You’ll usually hear slang spoken more often than you’ll see it in writing, though emails and texts often contain many conversational slang terms. Though slang sometimes gets a bad rap for being inappropriate or incorrect, it’s also highly creative and shows that the English language is constantly evolving over time.
Tumblr, YouTube, and Twitter have been leading the slang game recently. "Snatched" is officially the new "fleek," "sis" is the new "bro," and adding "boots" to the end of any adjective is totally a thing.
Check out some of the new slang words that cool kids on the Internet are using at Popsugar.com.