chihuahua mentality

Also known as the small dog mentality; A shorter individual who is exceptionally loud and aggressive - usually to taller people - due to insecurities about being short and presumptions about the tall person judging this.

This can be commonly observed in the animal world; e.g. the way a small dog reacts with a larger one.

David: Bro, I keep getting mugged by that shinkicker over there.

Bob: He's probably got that chihuahua mentality.

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