Top Definition
1. To come to a party late with alchohol (preferably jagermeister), get everyone drunk and then spew on a table top.
1. I'm gonna go to this party tonight and lunday it up.
by Linda Linda November 03, 2009
A person, often male, who is unstable or deranged.
"yo, what's his problem? he acting like a lunday!"
by Marcus Rhott June 25, 2008
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