Top Definition
Landiside is a common term that is used on the Central Coast of California that defines a sort of female social suicide; it is used when someone suddenly switches fashion senses or pretends to be in a social group of their choice when they really aren't in that group.

The word was supposedly created by a few bored teenagers by combining landslide and suicide together. Real classy, right?
Suzie is totally committing landiside. She was dressing like an preppy girl last week, and now she is trying to be a cowgirl this week!
by CaliforniaSheWolf March 30, 2012

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