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1.
the act of ejecting fluid or other substance (food or drink that was previously in the mouth) out of the nose due to sudden laughter
"Ow! That was so funny, I just asnered my coffee all over myself!"
"Never drink hard liquor at a comedy club. A whiskey asner can be severely painful."
by Jay October 30, 2004
 
2.
Acute Sponteneous Nasal ERuption. Laughing something out your nose.
Dave cracked a joke that made Shelly asner her green tea!
by Papa McCain July 29, 2009