It's like the word "nasty" but to a much, much higher degree. For instance, small wart on someone's lip might be nasty...but someone with anal warts taking a green diareah shit in someones ear is nursty.
by Tomass W April 21, 2006
Like "sick nasty" except even better and more cool. Should only be used in cases of extreme awesomeness.
Some kids, especially those who are intelligent, witty, and extraordinarly awesome, are "sick nursty"!
by D. Strunk March 23, 2007