To act out of control and crazy. Similiar to kirkin out.

Origin: Prince Georges Co MD, but also used in surrounding areas
Sam was so upset over losing her rent money, she started lunchin out.
by C. N. Leonard July 27, 2006
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Laughing uncontrollably. Possibly while stoned.
Oh my god, look at Terry. Dudes straight lunchin' out on the cat.
by IPoise December 23, 2014
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