A slang/secret term that refers to smoking marijuana. One would use it under certain situations where figures of authority, non-smokers, or fags are present and you don't want them to know what you're up to. Can also be yelled loudly when intoxicated, or to harass nerds.
Kenny: "It's a LAAAAAN PARTY!"
*Talking to nerds*
Dave: "Hey guys, wanna go LAN PARTY?"
Nerds: "No not right now, the LAN PARTY is Saturday night."