Top Definition
What a nice, normal girl can become when in a relationship: uncharacteristically jealous, possessive, neurotic, overly emotional, slightly paranoid. Ya know....crazy.
Before she started going out with Lukasz, Lisa was so normal. Now she's a certifiable Girlzilla.

Watch out dude, a regular chick can go Girlzilla after you move-in together.
by el pollo Lisa June 19, 2014
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