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1.
Any person or thing acting in a manner that causes the people around them to experience anger, annoyance, frustration, or the desire to either drink heavily, run away, or commit a homicide.
My husband is a real nutsling.

My kids are acting like nutslings today.

Wow, what a nutsling.
My nutsling phone keeps autocorrecting me.
by wizbef February 24, 2012
 
2.
A skimpy pair of underwear for men that barely keeps in the man's genitals. Often appears in lepard print and is made out of a silky material.
After showering at the gym, John put on his nut sling and sat around the locker room talking to old naked men.

Old men love to parade around the lake in nothing but a nut sling.
by Joseph A September 16, 2006