kestutis 

A person who enjoys being an animal

Person 1: Do you remember that guy at the party
Person 2: He was a real kestutis

kestutis by Jonh Pydar September 4, 2016

kestutis 

A person who enjoys beastiality and often pretends being an animal.

The kid in 6th grade that still plays with pencils in the math class for a more clear example.

Person 1: Hey, remember that guy we met last year?

Person 2: He was a real kestutis

kestutis by Kappa6921 August 29, 2016