Top Definition
Based on the character from the Anglo-Saxon tale Beowulf. Refers to someone who stays locked up in their room, with the curtains closed, and only wants peace and quiet. If their wishes are not met they will huff and puff and possibly even massacre a large group of people.
Hannah: Hey, is Zena coming out tonight?
Jill: No, she's grendeling as usual.
by Victoria Jumblesale November 02, 2009
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