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Jillaroo 

1. An exstremely unattractive or "undateable" guy
2. Someone that one must avoid flirting with at all costs
3. Male who tends to spend most time alone on the computer
4. Opposite of a jackaroo
Girl #1: Eww! Rachel check out that jillaroo!
Girl #2: Yea Kaitlin, he's totally undateable!
Jillaroo by kldsjiaehr787 February 13, 2009
Related Words

Jilleroo 

Dianne: "I'm so excited, I've got a job as a Jilleroo on Wuuluuman Station.
Jilleroo by BT4a November 5, 2011