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1.
adj. 1)extremely good-looking

2) could also refer to personality quirks as in
"The girl who bumped into the wall with a smile was ultra-cute"

"I'm smitten! She is ulta-cute"
"What does the girl look like? Man, she's ultra-cute"
by b's kneez February 09, 2006
 
2.
Someone who is a step above cute. These are the best type of people you will meet :)
"Awww my best friend is ultra cute ;)"

"Ultra cute starts with the letter U"
by moo-xoxo July 26, 2014