The definition of "Urlas" from Wikipedia

Urla is derogatory Latvian slang term, referring to all men and women aged 17 to 30 who are believed to be criminals or possess agressive habits.
The term is mainly used by Latvian middle class teenagers, and the meaning is similar to the British slang word Chav.
Typical urla fashion items include sport shoes or vinyl shoes, athletic wear, and leather jackets. A shaved head is believed to be essential for urlas. Also very common atributes are old BMW and other ~15-20 years old automobiles which usually become spots for gathering together. Urla`s musical taste can be described as a passion for anonymous electronic dance music with very monotonous rhythm, but popular MTV stars are quite popular among them too. Most popular alcohol in this comunity is cheap beer in 1.0l or 2.0l plastic bottles with high [9%] ethanol percentage or cheapest beer from 0,5 glass bottle packages.

Be aware of them!