When you're the most bad-ass person to ever walk the streets of El Paso, Texas, or when you're just too intense for everyone. Also can be used plural.
Abbreviation: UBA
"Hey man look at the ultimate bad-ass show off his car. That fucker."
"We are the ultimate bad-asses, no one can fuck with us.
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When things get really tough or crazy, and one has to try harder to accomplish a goal.
Holy shit, the football team scored a point under a minute on the 4th quarter! The other team has no other choice but to go balls out, dude!
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