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1.
WNL
Within Normal Limits. Term used in the medical professions to determine that all things are normal.
The Blood test was WNL
by Dr. Dexter Mayhem December 12, 2006
 
2.
WNL
whole 'notha level
On a different level, superior to competition, more impressive than other examples.

Often used as a twitter hashtag.
Maaaaaaannnn....my momma's fried chicken is #WNL. Seriously.
by leggooooo September 27, 2011