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An alien parasite, the villians of the Animorph series, written by K.A. Applegate. They closely resemble large earth slugs and are grayish-green in color. They enter the brain through the ear canal and take over the host body completely. Beings taken over in this manner are known as Controllers. The Andalites have been their sworn enemies for more than 39 earth years.
Andalite: "Yeerk filth!"
Yeerk by Malani October 7, 2006
Related Words
Yeerking Yeerk yeery ymeen Ymer Yaeer Yeeer Yeeerrrooo yeerd Yeerked
An expression, in Danish meaning literally “wide yoghurt¹”, used to describe something as awesome, especially in a surprising way.

¹) Ymer is a common Danish dairy product that most closely resembles yoghurt.
“Breeeed yyyyymer, dude.”

Det er bare bred ymer!”
bred ymer by Mikoangelo April 29, 2011

yeershating 

Yeershating (verb). The act of falling on the ground in uncontrollable laughter.

Based on the laughter of Yeershati.
"Man, I was hanging with my buds last night, and after Joe told this joke, we were yeershating all night."
YEERT is a phrase for when someone does a epic meme and get killed in the process.
TODAY WERE GONNA JUMP OFF A CLIFF AND LAND ON A TRAMPOLINE *jumps* YEERT*hits trampoline ripping right through it.
YEERT by HugeBoi May 14, 2019
Danish phrase used in the early 70 to the mid 80's

Normally stands for something good ^_^
"Det er bare bred ymer det der !"
bred ymer by goto80 March 9, 2005

Yeerking 

When one ejaculates in a person's ear, similar to the Yeerks of Animorphs, which enter a human host through the ear canal.
One time this dude was yeerking the shit out of a girl's ear. She couldn't hear right for a week.
Yeerking by larl kindberg April 3, 2010