A piece of unleavened bread found at Southern California restaurant Koo-Koo-Roo underneath chicken dishes. Figurative definition is a codeword for "let's get the f**k outta here". Commonly used at parties/functions hosted by close friends/acquaintances who would be offended if they were to learn of your desire to depart said party (usually without notifying the host/hostess of your departure)
"Well, this party kind of sucks. What say we chill for a bit, say our hello's, and then in 10-15 minutes, Lavosh!"